The new Nintendo 2DS system gives you all the features of the Nintendo 3DS and Nintendo 3DS XL, minus 3D viewing. And the price makes the world of Nintendo games even more accessible.
Curiously enough, the 2DS actually has only one screen - it's divided in two by the casing. The entire screen is touch-capable, but the top screen is covered by plastic so you can't touch it there. Like the Wii U's controller, this thing just looks weird and unwieldily, and while the price is nice, I doubt it will turn Nintendo's fortunes around.
Imagine a phone and/or tablet designed and built by Nintendo, with a proper integrated gamepad, capable of output to external displays, with access to Nintendo's entire back catalog of games - from the NES, through the Game Boy, SNES, Nintendo64, GameCube, DS, and Wii (if compatible with non-motion controls). Of course, new games can be published as well.
Nintendo should not be making yet another device to carry aside from your phone. They should be making a phone.