Elon Musk is right, if we look far enough, the world will start to see a decline in population and also those in the working age. The population is already declining in many countries of the west, and the number of working-age people is falling even in some Asian countries. The challenge in the next century no doubt would be the falling global population, but let’s worry about it then. For now, let each woman decide for herself how many children she wants.