Where the mass market go, so does the crown of gen leader. PS2 owned them and then Wii did to an even larger degree (but had a lot less core than PS2).
Right now Kinect 2.0 plus illumiroom and rumoured halograhics are by far the most enticing to casuals. And the only offerings I've seen (fact or rumour) that'll pull them away from their iPads and tablets.
As far as the core goes, MS is in good with them and they know they'll be well supported by both 1st & 3rd party games on MS system (unlike WiiU where 3rd party support is questionable).
None of this hurts MS chances in the slightest.