Nintendo should set aside a small team to bring
Super Mario Sunshine
Super Mario Galaxy 1/2
Metroid Prime Trilogy
Xenoblade
Zelda: Skyward Sword + Zelda: Twilight Princess
To the Wii U in HD with maybe some new lighting effects or something for each game. Just finish them, and then release one when ever you have a drought/dry spell in your release schedule for the next 2-3 years.
I'd like to see the original SNES Donkey Kong Country games re-done in HD graphics also.