If X360 doubles the sales of the original XBox it would of achieved well in Japan. MS would not abandon the Japan market because it is incredibly hard to break into and there are lots of Japanese developers who make games for X360 and they have invested lots of money in Japan.
The Wii is selling incredibly well in Japan and is the console of choice this generation replacing the PS2 for top selling console in Japan.
The PS3 is selling lower than expected in Japan.







