Usually when someone describes a new product as "the same as x through y while z", it means the new thing is solving a pain point. Like, "isn't Heroku just git hosted on AWS which runs a Rails server after a push?"
The process you're describing is definitely workable and some games take advantage of it, but the Ouya focuses solely on making the experience of playing and downloading games painless. Whether or not they'll succeed is a different argument, but the Kickstarter proves that there's demand for such a product.
Ah, are they providing their own UI, then? I'm guessing Android is just the backend, from what you say, is that correct? I.e. you won't have access to the rest of the apps and the system itself except through their custom launcher?
The process you're describing is definitely workable and some games take advantage of it, but the Ouya focuses solely on making the experience of playing and downloading games painless. Whether or not they'll succeed is a different argument, but the Kickstarter proves that there's demand for such a product.