The fertility rate in South-Korea is 0.92 at the moment, the lowest of all first world nations. This might add to that trend somewhat. But it`s not really a major issue for them, since they do not replace their population with migrants like we Westerners foolishly do. I doubt they, like Japan, will go down that road. It`s more to do with race differences than culture. They are simply more ethnocentric by nature.
We will stomp to the top with the wind in our teeth.
George L. Mallory