Nobody has solved the "problem" of a falling birthrate in a culture where there's easy access to birth control and general overall prosperity in an economic system where children are financial drains rather than financial assets, and they will continue to not solve it because it's not actually a problem?
I have a fantasy that birthrates continue to fall in the developed world, while urbanization continues to rise. Then we can demolish the empty suburbs and turn them into national parks.<p>A guy can dream, can't he?