The Case of the Book of Enoch, LXX translation, and the Dead Sea scrolls reveal that at the time of the Apostles what was considered scripture (canon in regards to the old testament) was a bit more fluid than people generally believe. Enoch falls into a particular catagory of liturature called Apocalyptic which was a particularily favorable form at the time. The Book of Revelation also follows this literary type in its presentation. The fact that the early Christians read and familiarized themselves with it and Copts still hold it as canon and certain dispensationalist (particularily the gap theorist sources with regard to who the nephalim were) have formulated certain ideas originating from this document is significant. Its actually a facinating study into the thinking of the early church.
I think you are presenting your case through rose colored glasses. What you say is true only to a certain point and then infers that which is not true.
Those entrusted with the scriptures - the Jewish people - did not recognize the apocrapha as scripture but only as devotional materials in their Jewish heritage or similar to commentators in our day. That is precisely how early Christians viewed the apocrypha in contrast to scriptures.
Second, since John wrote it during his own life time to seven churches in Asia minor (Turkey) it was fully received as inspired by the churches that received it. It was fully received by others. Only in the circles of a more liberal and apostate leaning type of Chrisitanity was it questioned and rejected.