From the New York Times:
"Raw numbers suggest there is a limit to how many homes can be rescued through reuse, however. Japan’s population of 127 million is expected to drop by a million a year in the coming decades. Efforts to increase its low birthrate have been only modestly successful, and the public has shown no appetite for mass immigration. “We have too much infrastructure,” said Takashi Onishi, an urban planning professor and the president of the Science Council of Japan. The government, he believes, will eventually have to cut services like water and road and bridge maintenance in the most depopulated areas. “We can’t maintain it all. We’ll have to make those hard choices.”"