Okay, so the big question is obviously how they move on from here. I think that we can all agree that the status quo is unsustainable now that reality has hit, so clearly, major changes needs to happen.
The first mistake Nintendo did was to not distance itself from the Wii. Wii U is a sloppy and confusing iteration that could of had a much better prospect if it was called and presented as something unique. It would of stand alone as the next, new console, and people would of resonated with it more efficiently. Nintendo tried to cash in on the Wii wave, since Wii clearly was a big success for them. The problem was that they clearly misjudged that mainstream had drifted to social and mobile, where there is much more accessibility, both in quantity and economically for the consumer. Had they made their next console differentiate itself from its successor, people wouldn't confuse it with the Wii. That's the problem, if people wanted a Wii, they'd buy a Wii. The Wii U is not the same as the Wii, but it has many similarities with it + the fact that it is directly associated with the Wii (Since it's named Wii U). The Wii fad has faded a long time ago, so they pretty much shot themselves in the foot there.
They have a variety of options on the table available to them, and I think that it's critical to examine them, as their old, current model needs to be revitalized. Why isn't this working? How do we fix our relationship with 3rd parties? How do we get the consumers back? What do the consumers want? How are our competitors faring, and what can we learn from them?
These are all important questions, and they really need to think outside the box on this one. There's no lenient quick fix here, as the console is a major bomb, so there's going to need some honest, serious self-reflection from Nintendo's part. Staying quiescent on this issue is detrimental, not only for Nintendo, but for the traditional gaming industry at large.