Yes, it seems obvious that the populace - apart from the Musks and Trumps of the world - see little possibility for a better life for their hypothetical children than they had, having experienced the ongoing crises of the 21st century, and therefore make the choice to not bring them into the world.

This idea is the logical ancestor of eugenics, which I am sure was not your intention. Parental Intelligence does not determine or indicate their progeny's intelligence. You can't really determine beforehand what exactly you are going to get, just that certain things that are dominant ilils are more likely. As far as intelligence goes that seems to be dependent on a lot of genes, not just one intelligence gene, so it starts to actually become more important how you raise your kid to actualize their potential actross whatever spectrum of their expression of their genes. A lot of people fall into this trap of thinking oh we are intelligent(which almost everybody assumes they have a lot more in the bank than they do in that regard), so we will have a smart baby. It's just not accurate. If you and your partner are in fact geniuses it actually starts to become less likely your kid will be as well when you look at the actual dispersal of geniuses. Its largely random and not common, so just statistically, you aren't likely to have that many really smart people closely related. In which case, and I say this tongue in cheek, but, good luck getting your stupid baby to reject capitalism. My brother-in-law who is a tech bro that thinks he embodies good genetics, thought he could potty train his kid in under a year and it's looking like they unfortunately for them, just got an average guy. I can't imagine how soul cruahing that must be for them. But the average is the average over such a huge sample set, usually because it is just a very common range. So if you do end up having kids, it would be a lot more productive to think, what am I going to do with my average baby. If you get a genius it'll be despite you, if you get a dummy, well, hopefully you can still love them anyway. Probably just better to spare you and your baby the disappointment that is being forced to share space with people you don't like due to losing the birth lottery.

I'll pile onto that and add we completely solved the climate crisis and militaries, nations, police, wars, violence, prejudices, and bigotry just straight up don't exist anymore. Then, and only then, would I consider having kids.

To all my children bearing comrades, good fucking luck. To all those on the fence, think longer and harder.

I'd imagine forcing communal or even state lead childcare would be the better option.