That micro story about billionaires going into their doomsday bunkers and 100 years later leaving and the world has healed without them that’s currently sitting on 2.4k retoots is exactly the plot of This Other Eden by Ben Elton, which came out in 1993. It’s just convergent thinking, I find it really interesting because it’s one of my favourite books and because everyone hates Ben Elton almost no one remembers it.