If it's a cultural bias, then what can you really do about it? Just look at the states: there are still some states where the majority of the population is against inter-racial marriage. There is no reason for it - just held over racism in my opinion. Sometimes it takes a while for a culture to evolve.
If it's a support issue, then that can be fixed. Xbox went out of it's way to make sure Japan was included in the Kinect launch. But perhaps they haven't done enough?
Would really need an open minded person from japan to know if that applies.