The doomsday argument - are we right on this?

First of all, I would like to clarify that I believe in long-term buy and hold (broad etfs, good stocks, etc.), and it's probably one of the best strategies. I am also not a doomsday person, prepper, or anything like that. The argument Anyways, I have been thinking for some time about the doomsday/slow decline argument that sometimes comes up in investing communities. It's usually something like this : "Most of the developed world, the West, USA, is currently at its peak, similar to Roman empire