Nintendo falling apart..? Blimey, things aren't great but they're not quite that bad lmfao. The 3DS is flying off shelves and software sales are also very healthy. Hyperbole much..?
As far as the Wii U is concerned they need to cut the price to £180/$250, give more GameCube titles the Wind Waker HD treatment, make the software that made developing Wind Waker HD so quick and easy available to third parties, collaborate with more indie developers such as Platinum Games and Crytek to bring exclusives to the system, collaborate with major third party publishers to bring exclusives to the system (I'm looking at you, Capcom, for Nintendo Vs Capcom).
As for the next console they need to drop the Wii name, talk to developers so that they can have input into hardware choices, make sure that it has a steady stream of software from first, second and third parties from launch and during and after the launch window and - most importantly - market the bloody thing ffs.