Earlier quoted context omitted.
I mean, a relatively easy fix to a negative replacement rate (at least when you have a well-run, wealthy, attractive country) is immigration. Replacement rate isn't a problem when you let more folks in
Fertility rates are below replacement on every continent except Africa, and they're dropping quickly there. Immigration isn't going to save us, at least not long-term. I think what'll happen is that areas that still have a vibrant age pyramid will put up borders (either geographic or economic or both) with ones that don't, and say "Sorry, you're on your own" to the latter. They protect their children at the expense o…
The US is an enormously attractive immigration target and can easily bring in enormous numbers of new workers if it wants to. It's so good at this that it actually has and those people pay taxes but don't get government benefits.