Presuming this will undermine birth rates (read: low or no population growth) Japan might be stuck in the cycle for years to come. That said, many First World

Presuming this will undermine birth rates (read: low or no population growth) Japan might be stuck in the cycle for years to come. That said, many First World economies have leaded on immigration to back fill the gap of low birth-rates. For examples: In the USA, that's been a noticeable growth in Spanish-speaking residents. In Germany and France, there's been growth in the Middle Eastern (mainly Muslim) residents. Needless to say, these shifts - economically necessary - have sociopolitical implications. It's possible these disconnects amplify as robotics and AI take over more and more jobs. Japan? What would be Japan's source of new immigrants? How easily or not can they assimilate into that culture? Or is a relative lack of diversity a positive as the socio-political fabric in the West gets more and more frayed, and not just at the edges.