He will kill everyone in Konoha, then everyone in the ninja world. Afterwards, he will crown himself king and eventually commit suicide. He doesn't really care about "what's happening afterwards", he just thinks about now. And now he wants to kill.
I'm kind of disappointed actually, with the way Kishimoto is treating Sasuke. Okay, he wanted to kill Itachi. Then, he wanted to kill the Konoha Elders. It's kind of logical. But now he's just a maniac psychopath killer. It doesn't make sense. He's not the only one who lost his family - Naruto didn't even have one to begin with! He should be grateful that he at least had someone to lean on in the first years of his life. In my opinion, he's just selfish.
Sigh. Sasuke is still a really delicate subject to me.
on crazy anime i saw a preview of the fight between sasuke and naruto so i dont think he'll ever turn good probably it will end with madara kabuto sakura naruto or kakashi ening up killing him. although i think he will die in a way like lelouch