what they are trying to do already exist as I showed in the NVIDIA video.
The link looked like a tech demo for the Tegra 3 and Miracast (wireless TV output)- is that right?
so what's exactly the difference between OUYA and just pluging your tablet to the TV and a gamepad?
As for the difference, I'm guessing:
Tablet + Gamepad: Multiple hardware specs, multiple controller types, but secondary display in-hand. Somewhat fragmented market.
Ouya: One hardware spec, minimum controller spec, app market for this spec. No in-hand display. Small (presently non-existent), but non-fragmented market.
Of course, you could always (in theory) pick a specific tablet and controller spec, put together an app market and a lot of hype and sell it as a brand. In practice it probably wouldn't really work though, unless you made the hardware or set up a sweet series of deals.
A lot of this whole thing is about presenting a brand, a spec to target, giving developers a reason to look at it, and gamers a reason to buy it.
For Ouya specifically, I'd say they're doing well enough on the latter point since they've got so many people to throw money at it, when the final system doesn't even exist yet.