Child subsidies are a great help for parents, but they don't seem that successful at getting people to have kids in the first place.

Apparently, married people are having kids at roughly the same rate as they did decades ago. However, fewer people are getting married and far fewer kids are being born outside of wedlock.

These are not necessarily negative developments, at least at the individual level, but they do point towards a significant change in human culture and society: increasingly, only people with a strong intrinsic drive to have kids will do so.

I don't think that we can predict the effect of this trend a few generations from now.