[TheAdamAndChe]

I agree completely with you. I think you may have been downvoted because you implied that multiculturalism isn't a panacea everywhere. Japan's culture doesn't demand perpetual exponential growth like a lot of capitalistic societies do, thus racial and cultural diversity isn't needed to provide a constantly growing, continually deleveraged workforce like the US does. A homogeneous culture provides a common identity and lowers conflict and miscommunication during interaction. They have low economic inequality and high quality of life. I see very little reason why things should change very much for them.