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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.

  • The war in Ukraine is strong evidence that manpower will continue to matter in war.

  • There is a longterm dysgenic effect with 2 kids per household, because the way human fertility is designed to work is that ~8 births occur and perhaps 1 or 2 of the healthiest go on to have 8-12 births themselves. A norm of 2 births is a norm of decreasing health over generations until the problems become apocalyptic.

  • In America, even without mass immigration, you have the high fertility of the ultra Orthodox Jews. So unless you want a future without music or art or equality or indigenous Europeans it’s a good idea to incentivize births. Eg 200k in New York, doubling every 20 years means hundreds of millions within 200 years. And they already wield an absurd amount of political power in New York

The dysgenics is trivial to solve with embryo selection, which unlike AI-powered robots has the perk of existing and already being cheap enough to be accessible for middle class people if they so choose. Even in the current form it'd be trivial for western government to subsidize usage for poor people (though I think there is enough slack to make it much, much cheaper to begin with through scaling).

Agree on the Ukraine war & on the problem of extremely fertile ultra-conservative populations, though.

The dysgenics is trivial to solve with embryo selection

The obesity pandemic is also trivial to solve with people eating less. Mass migration would be easily solved if a wall would be build at the Mexican border.

Even if an easy solution is known, even if the solution is proven to work, it can be very very hard, often impossible, to implement it.

Mass migration wouldn’t be solved with a wall because a large number of illegal immigrants (obviously more if the illegal land crossing route was closed) come legally and then overstay tourist or student or other visas. And, of course, a wall wouldn’t affect legal immigration.

The obesity pandemic is being solved as we speak with the new generation of appetite suppressant drugs. It will take time, but ultimately the market is generating the solution.

As soon as embryo selection for positive traits is possible, everyone except some religious extremists and the dirt poor (who should and in many nations will get it for free) will do it because parents have a biological drive to advantage their children in any way they can.

As soon as embryo selection for positive traits is possible, everyone except some religious extremists and the dirt poor (who should and in many nations will get it for free) will do it because parents have a biological drive to advantage their children in any way they can.

Designer babies seem like they’ll suppress the birthrate further among the sorts who do it for the same reason ultraselective preschools and the like to, leading to a natural selection effect towards tabooing it.

This is not true in practise. Parents who go for antenatal screens don't abort on a whim because the kid isn't just right, even in IVF, those who want kids almost always accept the first viable pregnancy with no obvious abnormalities.

They don't get into a tizzy about finding the absolute best, just the best of what's at hand.

In practice, the "my child must be perfect" mentality seems to lead to people hating the idea of parenting and not wanting to have kids- that's the reason for east Asia's anomalously low birthrates. It's hyper-k selection and human beings really hate hyper-k selection. Embryo selection feeds into that mentality for obvious reasons and I find it dimly hilarious that the modern west is selecting for religious fundamentalism so strongly. In 2260 or whenever star trek was supposed to be set the stereotype of whites will be dogmatic, socially conservative, and highly natal.