To be honest I don't think EA will be the last. If the next CoD game on the Wii U doesn't sell solid numbers (provided it's even coming out on Wii U), Activision will bail out as well outside of Skylanders.
The numbers these Wii U third party games are selling through is atrocious, there needs to be a huge pick up in the fall in the sales of those games (not just Nintendo's own games) otherwise publishers will move on.