I think the failure in extrapolation is that the numbers will absolutely go back up, eventually. Subcultures that incentivize high birth rates culturally will h

I think the failure in extrapolation is that the numbers will absolutely go back up, eventually. Subcultures that incentivize high birth rates culturally will have more kids, and eventually come to dominate society. If you want to see what culture will look like in a few hundred years, try and figure out what’s common between Mormons, Amish, and Muslims.