The Wii U honestly could by the end of 2015 will have pretty as good of an output as the GameCube did LTD.
If we confirm every Nintendo published Wii U game we know to be in development through 2015, lets even assume the only games that we don't know about that Nintendo releases for the Wii U in 2015 is Metroid U and Mario Party U:
Nintendo Land
NSMBU + New Super Luigi U
LEGO City Undercover
Game & Wario
Pikmin 3
Wii Party U
The Wonderful 101
Wii Sports Club
NES Remix Vol. 1 + 2
Wii Fit U
Zelda: Wind Waker HD
Super Mario 3D World
Donkey Kong Country: Tropical Freeze
Mario Kart 8
Bayonetta 2
X (Xenoblade 2)
Hyrule Warriors
Super Smash Bros. U
Pokken Fighters Tournament
Yarn Yoshi
Fire Emblem x Shin Megami Tensei
Fatal Frame U
Metroid U
Zelda U
Mario Party U
*End of 2015*
Lets compare this to really all the major Nintendo published games from the GameCube era prior to the Wii's release:
Luigi's Mansion
Super Smash Bros. Melee
Wave Race: Blue Storm
Eternal Darkness
Super Mario Sunshine
Animal Crossing
Star Fox Adventures
Metroid Prime 1/2
Zelda: The Wind Waker
F-Zero GX
1080 Avalanche
Donkey Konga
Mario Strikers
Mario Sluggers
Mario Party 4/5/6/7
Donkey Kong: Jungle Beat
Battallion Wars
Zelda: Four Swords Adventures
Paper Mario: TYD
Star Fox Assault Pikmin 1/2
To me Nintendo is really only "on the hook" for the Wii U through the end of 2015. If they want to phase it out after that, they will be well within their rights to do so IMO, and they'll have delivered enough Nintendo content to justify its existence.
The OP kinda stretches what Iwata said too, he never promised any number of years, but if Nintendo provides all the above listed Wii U titles, then to me a Nintendo fan can't really complain about the system not getting enough Nintendo support -- it's fairly easily on par with the GameCube at least even after just 3 years.
