What you're saying is identical to what people 'on the other side' say in regards to allowing broad immigration. Japan is a place where the language is not widely spoken at all, outside of Japan, and it has an extremely distinct culture that's quite alien to much of the rest of the world.
If they just started allowing large numbers of people to become citizens, their culture, people, and society would rapidly shift in a way that their historical roots would have little place other than in the footnotes of history textbooks. Even their language itself could die.
I think the big take-away when both sides are saying the same thing, even if on a sort of horse-shoe of logic, is that the only really good solution is for the people within countries to actually start having a sustainable number of children again.
If they just started allowing large numbers of people to become citizens, their culture, people, and society would rapidly shift in a way that their historical roots would have little place other than in the footnotes of history textbooks. Even their language itself could die.
I think the big take-away when both sides are saying the same thing, even if on a sort of horse-shoe of logic, is that the only really good solution is for the people within countries to actually start having a sustainable number of children again.