You couldn't port over a PC MMO onto the Wii U (and still have it be good).
I think we've answered the question of this thread, which is that no, the Wii U is not the perfect system for MMOs, generally speaking.
I do believe, however, that if the people were there to buy it and play it, the Wii U could have a good MMO, as long as it was made from the ground up for the Wii U, like @theblackdragon said.
