I figure evolution will solve that. The kind of people who don’t have kids while living in prosperity will die out. The ones who reproduce will stick around.
We’ll build mirror life to assist us so we keep not needing children before evolution has a chance to fix anything. I postulate it is coming this century.
This is only a problem when you look at the micro level of cultures or individual states. Sure, some culture may die out, but that's been happening forever.
There's 8 billion humans on this planet, and we're still fucking like we always have been. The human race will be safe from prosperity.
Humans will number 10 to 11 billion before the curve starts pointing downward. Even China, the supposed basket case of population collapse will "collapse" to their level of a few decades ago. The current population was supposed to be catastrophically overpopulated.
I don't agree with them but there are significant numbers of people who think 10 or 11 billion is way beyond sustainability.
Population decline is predicted or currently happening in some poor countries too. It's not a prosperity driven effect. Children don't die young anymore even in poor countries. There's just generally less pressure to spawn your own gang of supporters. Elon excepted I guess.
"Prosperity" implies that the problem is folks smart enough to not have children beyond the means to raise them into a similar or better lifestyle.
I prefer "Precarity" induced fertility collapse. Down here in the mud I guess I have a different view with my 1 child and wife with a heart condition who would likely die from a 2nd pregnancy.