>and to lower their standard of living year after year, and die out as the birth rate declines
Eventually the population will get low enough that standards of living start improving because there's so much land and resources per person, and the Japanese birth rate will start rising again. Which won't happen if they keep importing foreigners to compete with Japanese youth for resources.
Eventually the population will get low enough that standards of living start improving because there's so much land and resources per person, and the Japanese birth rate will start rising again. Which won't happen if they keep importing foreigners to compete with Japanese youth for resources.