It's probably also worth mentioning that nobody predicts birthrates to fall indefinitely - the human race isn't just going to die out because multi-child families are less common. Instead we expect that as affluence becomes more evenly distributed, the whole thing will stabilise at a lower population (and ideally one that leads to less competition for natural resources)

Outside of "great replacement" types who are worried about the continued supply of purebred aryans, I'm not really sure why anyone would be concerned by this

> Outside of "great replacement" types.

That is what stood out to me as well, but I could be doing them a disservice.