Japan has been highly patriarchal, hating of foreigners, especially gaijin, and fairly conservative overall if only from a Shinto/Tao/Buddhist perspective than a Christian perspecitve like the rest of the west.
The weabos who dream of living in Japan would be fairly ostracized unless they spoke perfect Japanese.
There are growing trends in the youth, but their conservative patriarchy is still holding strong for now.
On a side note, the massive amount of US debt Japan owns combined with the Yen carry trade means there could be a dramatic economic/societal shift in a short period of time, were anything volatile to happen.