Technology in the future will be more advanced than today, just like technology today is more advanced than in the past.
Yes, more technology will come in the future.
Yes and no. I will answer this from an Anthropological perspective since that is what I have a B.A. in. We could see a dark age or we could see a technological advancement. This could be significantly different at technologically different stages in some parts of the world. As an American, I could possible see the the Unites States fall like Rome or it could progress. Remember The Rome Empire split in two then the Western part fell why the Greek Byzantine part in the East prospered longer.
I good book about civilizations falling is COLLAPSE: HOW SOCIETIES CHOOSE TO FAIL OR SUCCEED by JARED DIAMOND