But Naruto said "How can I become Hokage when I can't even save one friend" or something like that so either Naruto will use Therapy no Jutsu on Sasuke and he will become a good guy, or... they both die XD
Because he also said that if they fight eachother they'll both die o_o
This time, though, his wording seems to imply that he'll succeed without them needing to die. He intends to break the cycle, thereby fighting destiny, which, effectively, would involve both of them surviving. Maybe I'm just rationalizing, though.
And that's a good point about therapy. Naruto really needs to help Sasuke out, since he is still dealing with a bunch of crap.