There now around 2,000,000 legal internationals residing in Japan. Add at least a couple hundred thousand if you count illegal. Subtract around a half million who are really Japanized N. Koreans.
If you take the male population 18-30 of Japanese, unemployment is 2-3 times the reported rates. Some of these guys are getting pretty scary. I wish I had an Asian face instead of a S. Italian one when I meet up with them.
No one here feels they need immigrants, except those who run factories or services in places where they can't get enough cheap labor.
I would expect, in the next 20 years, more and more Chinese to find a home in Japan. Many already are. Everyone thinks they adapt far better here than most other groups.
Charles Jannuzi