Then our super-intelligent AI descendants take over the mantle of “human” civilization. Every parent wants to see their child exceed them, so this isn’t necessarily a bad thing. It might even be in line with what you are arguing as AI may not be subject to all the crazy sex stuff OP is opposed to and could just go on doing meaningful stuff for the future of intelligence in the universe full time.

Alternatively, we could just grow new generations in artificial wombs if necessary.