As far as kicking the can down the road I agree it might be theoretically possible. I think the reaction that takes people to the opposite (I wouldn't call it Stone Age btw; a lot of these folk are still living this way in remote places, and it feels insulting to refer to them that way) is that human nature has a tendency to mission creep. Maybe if we go simple enough it'll be a while before it gets too toxic again. I understand that thinking. Alternatives would be any tech as long as you don't have to rape the earth more to get it, any food by same rules etc. How that might work in practise is anyone's guess, but I'd find a good rubbish tip and move in