I was more focused on the future tense of verses 11 and 12.
		
		
	 
11 And I say unto you, that 
many shall come from the east and the west, and shall sit down with Abraham, and Isaac, and Jacob, 
in the kingdom of heaven:
12 but the sons of the kingdom shall be cast forth into the outer darkness: there shall be the weeping and the gnashing of teeth. Mt 8
	
		
	
	
		
		
			When in the future, beyond when those verses were stated, would it be possible for someone to sit down with Abraham, Isaac and Jacob?
		
		
	 
It's not only 'the fathers' we now recline with in the kingdom of heaven, but Christ Himself!:
3 Blessed 
be the God and Father of our Lord Jesus Christ, who 
hath blessed us with every spiritual blessing in the heavenly places in Christ:  Eph 1
4 but God, being rich in mercy, for his great love wherewith he loved us,
5 even when we were dead through our trespasses, 
made us alive together with Christ (by grace have ye been saved),
6 and 
raised us up with him, and 
made us to sit with him in the heavenly places, in Christ Jesus:  Eph 2
1 If then 
ye were raised together with Christ, seek the things that are above, where Christ is, seated on the right hand of God.
2 Set your mind on the things that are above, not on the things that are upon the earth.  Col 3
"Many shall come from the east and the west"
The spread and extent of His kingdom was foretold in many places in the scriptures:
But thanks be unto God, who always leadeth us in triumph in Christ, and maketh manifest through us 
the savor of his knowledge in every place.  2 Cor 2:14
For 
the earth shall be filled with the knowledge of the glory of Jehovah, as the waters cover the sea.  Hab 2:14
And he shall stand, and shall feed his flock in the strength of Jehovah, in the majesty of the name of Jehovah his God: and they shall abide; 
for now shall he be great unto the ends of the earth.  Micah 5:4
So shall they fear the name of Jehovah 
from the west, and his glory
 from the rising of the sun; for he will come as a rushing stream, which the breath of Jehovah driveth. Isa 59:19
For 
from the rising of the sun even unto the going down of the same my name shall be great among the Gentiles; and in every place incense shall be offered unto my name, and a pure offering: for my name shall be great among the Gentiles, saith Jehovah of hosts.  Mal 1:11
Yet 
the number of the children of Israel shall be as the sand of the sea, which cannot be measured nor numbered; and it shall come to pass that, 
in the place where it was said unto them, Ye are not my people, it shall be said unto them, Ye are the sons of the living God.  Hosea 1:10
And it shall come to pass in the latter days, that the mountain of Jehovah`s house shall be established on the top of the mountains, and shall be exalted above the hills; and 
all nations shall flow unto it.  Isa 2:2
All the ends of the earth shall remember and turn unto Jehovah; And 
all the kindreds of the nations shall worship before thee.  Ps 22:27
Jehovah will be terrible unto them; for he will famish all the gods of the earth; and 
men shall worship him, every one from his place, even all the isles of the nations.  Zeph 2:11
Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy king cometh unto thee; he is just, and having salvation; lowly, and riding upon an ass, even upon a colt the foal of an ass. And I will cut off the chariot from Ephraim, and the horse from Jerusalem; and the battle bow shall be cut off; and 
he shall speak peace unto the nations: and his dominion shall be from sea to sea, and from the River to the ends of the earth.  Zech 9:9-10
God enlarge Japheth, And 
let him dwell in the tents of Shem.... Gen 9:27
For 
thou shalt spread aboard on the right hand and on the left; and 
thy seed shall possess the nations, and make the desolate cities to be inhabited.  Isa 54:3
And he shall send forth his angels with a great sound of a trumpet, and they shall gather together 
his elect from the four winds, from one end of heaven to the other. Mt 24:31
After these things I saw, and behold, 
a great multitude, which no man could number, 
out of every nation and of all tribes and peoples and tongues, standing before the throne and before the Lamb, arrayed in white robes, and palms in their hands;  Rev 7:9
At that time will I bring you in, and at that time will I gather you; for 
I will make you a name and a praise among all the peoples of the earth, when I bring back your captivity before your eyes, saith Jehovah.  Zeph 3:11
They shall not hurt nor destroy in all my holy mountain; for 
the earth shall be full of the knowledge of Jehovah, as the waters cover the sea. And it shall come to pass in that day, that the root of Jesse, that standeth for an ensign of the peoples, unto him shall the nations seek; and his resting-place shall be glorious.  Isa 11:9-10
	
		
	
	
		
		
			I say and I believe the word of God says, it is still future, when the sitting down with and the casting out thereof, takes place.
		
		
	 
Look closer at the time indicator percho:
43 Therefore say I unto you, 
The kingdom of God shall be taken away from you, and shall be given to a nation bringing forth the fruits thereof.
44 And he that falleth on this stone shall be broken to pieces: but on whomsoever it shall fall, it will scatter him as dust.
45 And when 
the chief priests and the Pharisees heard his parables, they 
perceived that he spake of them.  Mt 21