If they can make it reasonably easy to Ouya-fy an existing Android game, there will be reasonable incentive to add games to the store. In my mind, this is the riskiest part. Tablet and phone games are designed around touch. Many of them won't convert to a controller well, which will limit the number of games ported and make them more dependent on made-for-Ouya titles. They'll need to be a good-sized market for that.
I think that the creativity from the side projects that come out of Ouya have more potential to be disruptive than the console itself.
And you could get the same deal with XLIG and Smartglass