Yet I bet they do better in 50 years from now than those that import population replacements.
Their problems are quickly becoming our problems. How many ‘good Christians’ have families of 2 or fewer children, by design?
China has even a worse social problem. Fifty million more men than women is a breeding ground for social instability.
That is all well and good, but when we leave our society to be expanded by illiterates and immigrants, that is a true problem.
How many taxpayers have been aborted and contracepted out of society over the last five decades simply for the benefit of a new car or bigger house? Would our society been better off with fifty-five million more Natural Born American citizens or the fifty million foreign born that have legally immigrated? That doesn't include the 12-40 million who are here illegally.
As for Japan, They will most certainly be absorbed by a greater power, one that has an expanding population. I would figure Indonesia or even the Philippines is the most likely potential invader. The law of the jungle is still the way of the World and those who don't reproduce disappear and in very short order.