Why say is it enough? It will be overkill with Mario World and Donkey Kong alone. The Wii U isn't the front-runner of this generation but it will have some great games.
If Nintendo chooses a realistic Zelda(has been compromised because game hasn't really entered development) and makes it look awesome, MK8 sells awesome, and Smash 4 does well, the U should have an install base of at least 20M.
We keep questioning Wii U and we only output negatives. Have you forgotten already that the first HD Mario Kart will exist in April, and possibly sporting some of the best cartoon/ cell shaded graphics in existence? Wii U is no Wii but the games that Nintendo makes should pave the way for better third party support. That is how all third parties become profitable. Can you name me one Third party game, on a nintendo console/handheld, that outsold Nintendo's top software? Yeah... there kinda isn't one. So just wait a couple of years and see how it goes. If Wii U is still doing miserable then, you can call me out.