I'm not nearly as optimistic about this as you.
Nintendo catered to the casual player before. Now they're moving to cell phone games? It's just continuing a downhill trend of very casual stuff.
The main bright side I see to this is that they might port games like pokemon to phones, but then, what need will we really have for a real handheld system like the 3ds?
I'm glad Nintendo is starting to realize how badly they suck at online gaming. At least they're getting outside help this time.
Mobile and handheld? If anything, they'll look at the vita as an example of failure. Good system with few games, they'll probably tone down the hardware in favor of just above what they need to play flappy bird and tower defender games. It will absolutely be nowhere near as powerful as the vita.
I don't like where this is going at all.