One word: Market. It doesn't matter if the Wii U can run the game, the fact of the matter is that Wii U is a different demographic when compared to the Xbox/Playstation. Whereas Destiny will sell large amounts on Xbox/Playstation, the same could not be said for the Wii. When that is coupled with the different layout of the Wii controller, it doesn't make sense for a business standpoint to support the Wii. I would think it more likely PC support comes around than Wii support.