I'm not even going to jump in on the mobile talk. Personally I think it's unconventional, and while there's hundreds of thousands of mobile devices, it doesn't translate to a large audience for Nintendo games. Anyone with a 3DS is getting a Nintendo game, but anyone with a smartphone doesn't have to, especially in a market littered with free or dirt cheap games.
I don't want to see Nintendo go the way of Sega. I've probably said this before, but you're basically asking for trouble rather than any salvation of a company you grew to love. Has Sega really being doing good for themselves? Then again, Nintendo always did have more to offer in the long run, but the times have changed.
Doom and gloom aside, because damn if we don't hear it all the time (maybe people get aroused by it), but it is true that Nintendo's chief problem is strategy. Something to consider is, well, rather than Nintendo being ignorant to the modern gaming conventions of other companies, they're actually ill-prepared to match said standards that have been established. It wasn't long ago when Eurogamer had an article when an unnamed party explained the difficulties they faced with developing their game on Wii U. The biggest problem was how none of the Nintendo representatives were familiar with the online infrastructure of PSN and Xbox Live. Literally knew nothing about them and asked to explain and so forth.
The 3DS isn't in hot water, and anyone who wants to argue it's failing is out of their mind. Nintendo has to be aware of how fortunate they are in the handheld market. It's like they must depend on it, but truthfully the company has the cash cushion to recover from failures. If the Wii U does fall away, though there are great games, Nintendo still has another shot. However, they need to really consider to match Sony and Microsoft in more regards. You don't have to replicate every damn thing, because innovation is still important, but other companies and developers are capable of laying groundwork for video game technology.
Sony was willing to copy you Nintendo, maybe take a look at their online services with proper account management. The eShop is literally on the verge of being in the same camp, but it still reeks of the Wii's Shop Channel. I know Sony and Microsoft are bigger companies with many other divisions, but you only have to worry about their video game aspect. If you noticed anything about the Xbone debacle it's that gamers still widely prefer their consoles to be gaming machines first, other functions optional. You're so close, but try to remember that the industry is constantly changing and what worked back at the turn of the millennium won't hold true a decade later.