Absolutely stole their thunder - well, not exactly stole, as they have been working on tables probably longer than Nintendo has. (Slate PC)
And in the general public it become more unclear - why buy a WiiU when I can get an Xbox 360, use my current larger Ipad/Droid/Windows 8 tablet, and I get Voice search, Kinect Play, and all the streaming options.
By going multiplat they made it open to everyone. Very strategic decision.
We shall have to see how the Xbox Glass gets used. That could take much extra programing - but I would love to have a table or PC out with a nice big map view as I play through Halo4 with my friends.







