I look forward to the problems we will face then, and the apocalyptic narratives the media will invent about this new problem. Here's my shot at a few:
- Even with better quality of life its going to be hard to make people who are over 70 work productively. But without children less and less people will need to take care of this large old age group. And they will need a bigger and bigger slice of the economy to survive.
- Wealth inequality will rise just from the fact that there are less productive people and people with wealth will live longer.
- Immigration won't be the solution for western nations that it used to be. And poor nations with insane birth rates don't have them any more. Already eastern europe, india, phillipines etc are becoming rich enough that much much less people want to emmigrate. Africas next. Cheap labour for corporations will basically dry up.
I predict these issues will cause bigger problems than population expansion ever did.