The Ouya doesn't promise a brilliant future. It sells at $99 using a less than top-level Tegra 3 quad-core processor. As an Android device, it signals that it'll probably be displaced by a better iteration as chip prices go down. Ouya execs have said as much. There's no 10 year lifecycle on Ouya 1.0.
You get the Ouya for the now. You get it for the summer of 2013 and the fall. You get this to wedge it in the gaps of your gaming life. There are some good games, but not many, and they're hard to discover. The Ouya is a fascinating experiment and can be fun for those for whom $99 isn't much to plunk down.