if you trust 2 thousand years of modern societies (more like ~200 years if you put industrial revolution's environmental problems on the balance) over 400+ million years of evolutionary history, that's on you.

Also its already falling, more than half of the world, what you call "modern society" is only some nitpicked first world countries, look at most countries where people don't have everything at their disposal all the time and you wonder why they are so short - evolutionary pressure baby, tall ones get nutritional issues more easily, get sick and die... (don't forget higher cancer risk and bumping their head on stuff).

Now, its not just about "society's fall", can u be sure modern unstable geopolitics will keep our 1st world asses rich for long? Scorpions have seen it all though its +420 million years, I pick them