I guess this Autumn and Winter we'll have some preliminary but significant answers about the future of MS in gaming market. IMVHO it's here to stay, its fears about a big selling console eating an excessive chunk of home computing aren't over, and after Sony, Nintendo could be MS' next target if it starts even vaguely suspecting it could widen its next consoles' features. So, if besides fear, profit too comes to increase motivations, why should MS leave?
BTW already Kinect is actually made to heavily hit Balance Board, so Nintendo with it (although Ninty can survive healthy and profitable enough even if BB sales are heavily crippled), MS is just pretending it's aimed towards Move and Sony only to delay Nintendo's reaction as much as possible.
