A simple (though far from easy, and likely complex in political reality) solution to this sort of problem is to import workers. Japan, as a high productivity n

A simple (though far from easy, and likely complex in political reality) solution to this sort of problem is to import workers. Japan, as a high productivity nation, would be a very desirable destination for workers willing to relocate. The practical issues stem from xenophobia and (based on my naive understanding) higher cost of integrating with such a foreign culture (for much of the world).