Honestly I think it be utter crap if he turned good again or somehow was able to come to the village. I would be fine with him having a revelation right before he dies, but other than that if he keeps flip-flopping his character is really annoying.
Sasuke killed Danzo (even though sorta a bad guy, he was still a leaf ninja), Nearly killed Sakura and Kakashi, Basically killed Karien (saved by Sakura though), He caused the Raikage to lose his arm, and he killed several Samurai, and crushed several more when he collapsed the building.
He's a gosh darn international criminal for attacking the Kages, he's a missing-nin.
My prediction is, he goes and talks to Madara and finds out the purpose of clan or shinobi or whatever his question is. He gets on board with moon's eye plan, and then faces Naruto, Naruto and Sasuke fight, both of them nearly die, and somebody else comes and makes the killing blow on Sasuke because Naruto's unable to do it, like Sakura or Kakashi, because even though he wanted to die with Sasuke, they don't want him to fail on him dream of being Hokage, and they give a heartfelt speech about how Naruto did save Sasuke. Sasuke dies slowly, apologize and thanks everyone, now he gets to go see his family, and then team 7 laughs and says goodbye.