You talk as if immigration is some kind of switch but Japan has been a mono culture and they don't speak anything but Japanese, so it'll be hard to have that many foreigners to support the population decline.
And then pensions and healthcare become problems.
Cheaper housing means real estate business is going to shrink with many open rooms.
And then pensions and healthcare become problems.
Cheaper housing means real estate business is going to shrink with many open rooms.
Where is your optimism coming from?