Here's an article describing how Japanese retailers are dropping the 360 due to lack of demand. They go on to finish:
Two generations of XB haven't made a dent. What can MS do with XB3? Will that impact their desgin for the platform, making choices to favour the Japanese market? Or should they give up on the console there and look for a mobile platform for Japan?While the console's gradual disappearance from store shelves does not prevent gamers making their purchases online - indeed, it is our understanding that Amazon now handles a substantial proportion of Japanese Xbox 360 software sales - it does complicate things for Microsoft.
With an Xbox 360 successor widely accepted to be released in 2014, the firm may struggle to convince Japanese retailers to stock and prominently display the console when they have a decade's worth of proof that higher returns are available elsewhere.