The Quiet One I agree that a fulfillment did happn in 70 CE and Jehovahs witnesses accept this also ... but even after 70 CE end time propheteers were warning of another impending end ... this time Rome's end was imminent. I think this is because one of the major signs of the end are the traits spoken of in 2 Timothy 5 ... so as long as people possess those traits there will be end time prophets and the end will always be imminent during one's lifetime. We can see this in the history of jehovahs witnesses. The end was supposed to come in 1914, 2 tim 3 was one of the signs ... and in fact there was a major upheaval. Then it was supposed to have come with the second world war ... something did end then ... a way of life, a world view ended and it would even seem that mankind was liberated from many self serving people who were responsible for making life perilous. A new era was ushered in but not the new system.
Looks like... as long as mankind possesses those traits (and along with other signs) the world will be about to end and end time prophets will flourish.
this sort of a discussion with some Jehovahs witnesses is quite fruitful - it is not antagonistic but it is stilll dealing with a controversial issue.
http://en.wikipedia.org/wiki/Eschatology
best wishes and thanks for raising this subject
Queenie C