I have even seen some full preterists admit that God could always end this physical world at some later time; it just isn't revealed in the prophecies.
Possible but in seems to contradict other passages such as:
Ecc 1:4 One generation passeth away, and another generation cometh: but the earth abideth for ever .
If Nero was the final antitype
(that John was referring to), then that would not be mysterious to the future generations of the Church at all.
Why must Nero be a type or anti-type of anyone or anything? Again, you seem to be the filter that determines what the types and anti-types are, and what the do or do not fulfill.
As far as Nero not whom John was speaking of, many in the early church did in fact see it as so:
F.W.Farrar
"all the earliest Christian writers on the Apocalypse, from Irenaeus down to Victorious of Pettau and Commodian in the fourth, and Andreas in the fifth, and St. Beatus in the eighth century, connect Nero, or some Roman emperor, with the Apocalyptic Beast ." (The Early Days of Christianity p.541)
"the clue is preserved for us, not only by Jewish Talmudists, and Pagan historians and authors, such as Tacitus, Suetonius, Dion Cassius, and Dion Chrysostom; but also by Christian fathers like St. Irenaeus, Lactantius, St. Victorinus, Sulpicius Severus, and the Sibylline books, and even by St. Jerome, and by St. Augustine. Nothing can prove more decisively than these references that for four centuries many Christians identified Nero with the Beast."
"Beyond all shadow of doubt or uncertainty, the Wild Beast from the sea is meant as a symbol of the emperor Nero. Here, at any rate, St. John has neglected no single means by which he could make his meaning clear without deadly peril to himself and the Christian Church. He describes this Wild Beast by no less than sixteen distinctive marks, and then all but tells us in so many words the name of the person whom it is intended to symbolize." (The Early Days of Christianity, 5.28.5)
Clement of Alexandria (2nd Century) "We have still to add to our chronology the following, -- I mean the days which Daniel indicates from the desolation of Jerusalem, the seven years and seven months of the reign of Vespasian. For the two years are added to the seventeen months and eighteen days of Otho, and Galba, and Vitellius; and the result is three years and six months, which is "the half of the week," as Daniel the prophet said. For he said that there were two thousand three hundred days from the time that the abomination of Nero stood in the holy city, till its destruction. For thus the declaration, which is subjoined, shows: "How long shall be the vision, the sacrifice taken away, the abomination of desolation, which is given, and the power and the holy place shall be trodden under foot? And he said to him, Till the evening and morning, two thousand three hundred days, and the holy place shall be taken away."
"These two thousand three hundred days, then, make six years four months, during the half of which Nero held sway, and it was half a week; and for a half, Vespasian with Otho, Galba, and Vitellius reigned. And on this account Daniel says, "Blessed is he that cometh to the thousand three hundred and thirty-five days." For up to these days was war, and after them it ceased. And this number is demonstrated from a subsequent chapter, which is as follows: "And from the time of the change of continuation, and of the giving of the abomination of desolation, there shall be a thousand two hundred and ninety days. Blessed is he that waiteth, and cometh to the thousand three hundred and thirty-five days." " (The Ante-Nicene Fathers, vol. 2, p. 334)
Augustine (4th Century)
"What means the declaration, that the mystery of iniquity already works?... Some suppose this to be spoken of the Roman emperor, and therefore Paul did not speak in plain words, because he would not incur the charge of calumny for having spoken evil of the Roman emperor: although he always expected that what he had said would be understood as applying to Nero."
http://www.preteristarchive.com/StudyArchive/n/nero_emperor-beast.html
I see that the Millennium was supposed to be the 40 year period from AD30-AD70.
This is a difficult topic no matter which view you hold to. However this view of the Millinnium seems to fit the best for me.
But still, the big problem with this is still, this "Millennium" would end with the parousia, which was supposed to be the fulfillment of all, and hence the beginning of these promises. After all, this Millennial reign with Christ was still prophecied as future by John. And it is after the resurrection of those who had overcome the mark of the beast and other tribulations associated with "the end", while the resurrection was still spoken of as future as well. This is one area where the partial prets really have a good point against full preterism.
Good thoughts. Lets look at Rev 20:2-6
Rev 20:2 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years,
3 And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more, till the thousand years should be fulfilled: and after that he must be loosed a little season.
4 And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
5 But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.
6 Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
I believe this was occuring at the time of the writing of Revelation. Clearly there was some kind of Kingdom during the writing of the Gospel:
Col 1:13For he has rescued us from the dominion of darkness and brought us into the kingdom of the Son he loves,
and bound him a thousand years,
Luke 10:18 And he said unto them, I beheld Satan as lightning fall from heaven.
19 Behold, I give unto you power to tread on serpents and scorpions, and over all the power of the enemy: and nothing shall by any means hurt you.
Matt 12:25 And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand:
26 And if Satan cast out Satan, he is divided against himself; how shall then his kingdom stand?
27 And if I by Beelzebub cast out devils, by whom do your children cast them out? therefore they shall be your judges.
28 But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you.
29 Or else how can one enter into a strong man's house, and spoil his goods,
except he first bind the strong man? and then he will spoil his house.
And I saw thrones, and they sat upon them.......... and they lived and reigned with Christ a thousand years.
Eph 2:5 Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved

6 And hath raised us up together, and made us
sit together in heavenly places in Christ Jesus.
but they shall be priests of God and of Christ, and shall reign with him a thousand years.
I Peter 2:5 Ye also, as lively stones, are built up a spiritual house,
an holy priesthood , to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
Rev 1:5 And from Jesus Christ, who is the faithful witness, and the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood,
6 And
hath made us kings and priests unto God and his Father; to him be glory and dominion for ever and ever. Amen.
Blessed and holy is he that hath part in the first resurrection
John 5:24 Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation;
but is passed from death unto life. 25 Verily, verily, I say unto you,
The hour is coming, and now is , when the
dead shall hear the voice of the Son of God: and they that hear shall live .
It seems that the things that will happen during this reign were already going on.