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This -0.2% figure you're citing is hiding rapidly aging population. TFR is 0.8. They'd have to let in about half a million immigrants, every year.

Unless the immigrants adopt Korean culture, then even then, Korea won't exist.

So we should rather be saying that America and Canada and Sweden won't exist?

> Canada and Sweden

Both of these countries now have ethnical enclaves, thanks to multiculturalism. So I'd say yes.