Ubisoft is done with the WiiU after this holiday season.
Nah, Rayman sold the best on the Wii U. Stuff like Valiant Heart, and Child of Light will sell well too on the Wii U. Its not a coincidence since Nintendo has developed a community that loves to play 2D platformers on their system for decades.
If anything, Nintendo needs to develop strong 1st party FPS games to help out 3rd parties. This is why Nintendo should have greenlighted a Metroid Prime game for the Wii U, despite it won't sell as much as another Donkey Kong Country Returns game.