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Birthrates only matter because of mass immigration. If you don't have mass immigration they're irrelevant, especially with the pace at which automation via LLM (including in the material world with PaLM-E and other multimodal models for robotics) is advancing.

It doesn't really matter if South Korea's population falls from 50m to 10m provided two things are true:

  • Firstly, that total productivity can be maintained (this seems likely with LLMs able to take over a large percentage of white collar labor over the next few years, and robotics + multimodal LLMs likely to take over a large percentage of blue collar labor over the next decade or two). In this case, no economic collapse is likely, and while fiscal policy might need to adjust to redistribute generated wealth, that's not an existential issue.

  • Secondly, that those very same advances mean that military preparedness isn't damaged by falling number of young men, which again, advances in drone warfare suggest is likely. Plus, North Korea's birthrate is also collapsing (see Kim's recent comments) and it has half SK's population, so any disadvantage is unlikely to be large.

The main reason to be worried about birthrates is demographic competition as in Lebanon, in Israel, in India and so on. If a minority group has much higher birthrates than the native population, the long-term balance of power in a nation is almost guaranteed to shift.

Birthrates only matter because of mass immigration. [...]

The main reason to be worried about birthrates is demographic competition as in Lebanon, in Israel, in India and so on. If a minority group has much higher birthrates than the native population, the long-term balance of power in a nation is almost guaranteed to shift.

To maybe point out the obvious, a TFR below 2 doesn't hit uniformly across a population. If Lebanon, Israel, or the US for that matter are magically reconfigured into ethnostates and their borders sealed tomorrow, those countries will not have the same genotype in a hundred years with half the population. The type of person who succeeds and breeds in the modern environment is of an unusual temperament, and their characteristics will sweep the board and change the character of the country.