I'd actually be fine if Obito realized he was in the wrong... Only after he fought with Kakashi or Minato and was beaten and severly injured, taken out of the fighting. And if he didn;t bring everyone back... I'd of liked him to try and stop Madara or screw with his own plan somehow.
If Naruto is sealed with the Juubi, I'll be upset.
Any other characters getting the Rinnegan. . .Seriously.
If Itachi comes back, I'm done.
If Orochimaru is. . . One shot again. . .
If there aren't any more deaths of important characters, I'll again be upset.