Wii-U is failing, you say? Nintendo is doomed, you say?
Funny, I seem to recall this little thing called a 3DS, that despite all the declarations that Nintendo is losing it's audience to smart devices, is still selling remarkably well. If Nintendo's head wasn't six miles up it's own ass during the Wii-U's announcement/launch, they would have figured out that their presentation and marketing were an absolute joke, and compensated. Damage control at this point is going to take some serious third-party sucking up, as well as rushing some big name games out the door, and fast.
At the end of the day Nintendo keeps posting losses on the Wii-U, and lowering projected sales (on the 3DS as well).
Are they doomed? I don't know. But obviously the 3ds "selling remarkably well" isn't going to cut it here.