the big issue is that the time scale is probably too fast for evolution to catch up by default
This isn’t growing wings, it’s some very simple changes. If the problem is literal fertility (too few sperms, women having difficulties getting embryos to implant, etc) then it’s probably exactly the kind of thing that evolution can select for in a handful of generations. If the problem is a more general cognitive one (given the existing hyperstimuli and/or cultural context that make people less willing to have children, evolve people whose values are geared so that they have a stronger drive to have children even in these circumstances), that might be a lot more complex, if possible at all. But honestly anyway I doubt biology will play any major role in this either way. It’s a matter of culture and economic incentives, mostly.
This isn’t growing wings, it’s some very simple changes. If the problem is literal fertility (too few sperms, women having difficulties getting embryos to implant, etc) then it’s probably exactly the kind of thing that evolution can select for in a handful of generations. If the problem is a more general cognitive one (given the existing hyperstimuli and/or cultural context that make people less willing to have children, evolve people whose values are geared so that they have a stronger drive to have children even in these circumstances), that might be a lot more complex, if possible at all. But honestly anyway I doubt biology will play any major role in this either way. It’s a matter of culture and economic incentives, mostly.