Rainbird on 20 June 2010
Could be a problem for Kinect I guess, though any game that has you move around might want two players max by design anyway. No need to crash the livingroom! 
And I don't think it will be a problem for Move either. You still have four player options on the DS3, and I imagine that most Move games that would do well with four player multiplayer are games that don't use a Nav controller anyway.
I don't think it's gonna be an issue to be honest.
