Earlier quoted context omitted.
The solution is immigration but with high barrier to entry. I live in Denmark, a country portrayed as anti-immigrant by American and British media. However there is no opposition to educated professional immigrants from India, China, Iran and Eastern Europe. Brain drain of these countries could be a problem but countries like India and Iran are probably producing many more highly educated individuals than they can do…
You cant just easily immigrate to CJK countries.You will not become a part of the society.That's just impossible.Not even those of us that married koreans,speak the language and know the customs are that accepted in the society.We are tolerated and easily live and work there but you will never become korean or japanese or chinese. You will always be the "foreigner".
Sure, there is some minor "friction" because of my different ethnicity (basically I look white), such as random people first assuming that I am a foreigner, which is completely understandable for historical reasons. I do that myself, whenever I see a white or black person, my first reflex isn't to assume that they are Korean too, there is a 99% chance that they are foreigners. But all it takes is a 10mn conversation for them to know that I am "one of them". I sometimes get puzzled looks from people who have never met someone like me, but that's mainly because most of the population don't even know you _could_ naturalize and become Korean. At the airport, the staff speaks in English to me at first, but as soon as they see my passport they profusely apologize and switch back to "Korean" mode. That's about it.
I do however understand and sympathize with the fact that many foreigners, even long-term residents, might feel the way you described. I am just disputing your claim that it's "impossible" to become Korean.
I personally think because Korean society functions in a very binary way: either you accept everything and take it in as a whole and then can become a member of society, or you just do a few things (such as marrying a Korean person, speaking Korean to a certain level, etc.) and you don't. There are valid reasons to act like that, there is this instinct of jealously preserving Korean culture out of fear that it will be taken over by other giants: China, Japan, the US, etc. And Koreans would rather keep the bad aspects of their culture than risk losing it all. It's just part of the deal, and I think many foreigners have a hard time understanding/accepting this fact.