Genetic Koreans are not necessarily staying in Korea, so a low birth-rate in country doesn't mean their genes will be wiped off the planet. Korea is a pretty serious exporter of people.
Obviously, the greatest thing that changed over those last 60 years is they're no longer recovering from a war that killed a pretty hefty amount of their population. While I'm sure it didn't need to decline quite so much, fertility rate was never going to stay what it was in the late 50s. You can see a pretty obvious recovery spike here: https://en.wikipedia.org/wiki/Demographics_of_South_Korea#/m.... It was only in the past 20 years that they declined below 1920s level.
It's also worth remembering that being oppressive to women is (definitely at least probably) not a genetically tranmissible trait. If the 22nd Century really does end up being dominated by Pakistanis, you can't just automatically assume they'll stay culturally identical to what they are today. Presumably, the Korea of the 19 century was a lot more oppressive to women than the Korea of today.
Obviously, the greatest thing that changed over those last 60 years is they're no longer recovering from a war that killed a pretty hefty amount of their population. While I'm sure it didn't need to decline quite so much, fertility rate was never going to stay what it was in the late 50s. You can see a pretty obvious recovery spike here: https://en.wikipedia.org/wiki/Demographics_of_South_Korea#/m.... It was only in the past 20 years that they declined below 1920s level.
It's also worth remembering that being oppressive to women is (definitely at least probably) not a genetically tranmissible trait. If the 22nd Century really does end up being dominated by Pakistanis, you can't just automatically assume they'll stay culturally identical to what they are today. Presumably, the Korea of the 19 century was a lot more oppressive to women than the Korea of today.