The Wii U probably won't gain significant third-party support during it's life-cycle. That boat has left the pier. At this point, Nintendo needs to work on getting third-parties to consider their next console--or not, if they decide to go even farther away from direct competition with Sony and Microsoft.
The Wii U did seem to have a bit of a chance of gaining more third-party support at the beginning of this generation but the fact that it failed to take off kind of killed that. Now, I can't imagine most games finding enough profit in a Wii U version for them to dedicate the resources for it. First it was competing against the PS3/360, which a massive disparity between installed bases, and now it's up against the PS4 and XO, both of which will end up with much larger installed bases before it's all said and done. There is no confidence in the Wii U among third-party publishers.
