So, Japan has been having some trouble lately with people. Not any specific person, mind you, but with Japanese people in general. Wait, Japan is having trouble with Japanese people, you ask? Exactly, well, truthfully, the problem is not the people, but the number of them.
Japan's population is slowly decreasing and the ones who are alive are slowly aging, as humans tend to do. Most of the Japanese population is retired, and with more and more people moving to the cities and having fewer and fewer kids, you can see what 20-30 years might do to this country.
The ironic part is, even though Japan knows that they need more foreign workers, (or some kind of anti-condom movement) they have decided not to, at least for now, open their doors a bit more to foreigners. So my theory is as follows: Japan is either going to develop cyborg-bodies and transplant all the old people's brains into them, or develop cloning to clone workers.