Whovis going to take care of all the 80 year old Japanese people in 50 years when they have less medical staff? What happens to all the empty and decaying buildings that have no one left to maintain them all? What happens to the smaller rural cities with a current population between 75,000-200,000 people when the only job options are hospice care because the local employers can’t operate anymore? Decreasing population by 50,000 a year over a few decades is manageable. Japan and Korea are way past that point and there simply won’t be enough people to care for the ageing population and shrinking pool of working people and children.