No shit. I know this already, I wasn't expecting great character development or anything just consistent character development. It really doesn't make any real sense why Sasuke wants to do what he wants to do after he changed his outlook when Zombie Itachi talked to him.
Plus he already killed the man responsible for the Uchiha massacre, so why would he still want revenge after that? Things just don't add up at all, and yes I do realize Sasuke had those motivations to destroy the "Leaf" after Danzo's death, which is still abysmally stupid and senseless.
If a character is going on a quest of revenge there isn't any real logical reason why someone like Sasuke would go beyond that. Sasuke's character development is basically, "Now I've had my revenge, now I conquer the WORLD!" which doesn't really follow any semblance of logic from what Kishimoto has written about Sasuke in the series.
If they should battle - Naruto and Sasuke - it should be a battle over who becomes Hokage.