I think differently. I think people don't have kids either because they're poor or because their integrity has been completely eroded by the fiat world (cantillon effect, nihilism, malthusianism, granular polarization,etc), not because lack of pickiness.
In my opinion the way to solve depopulation is to make the procreation process as easy as pushing a button. Every person that participates in the bitcoin standard provides an exponential advantage to everyone else (so pickiness is somewhat hypocritical). The incentives of every person in the planet will therefore align to have kids because nihilism and "economic stupor" are only based on lack of conviction. The nihilist culture will just be dragged by the bitcoin standard.
But, how to make procreation easy? Just by having more and more kids produced.
https://galepooley.substack.com/p/how-learning-inverts-the-supply-curve