I think after the war Sasuke would say he doesn't need him anymore and kills him with Amaterasu. Or Sasuke will pull a Part 1 Sasuke move and lets Orochimaru live. And the choices Sasuke made in part 1 were horrible.
Example: He thought he could have killed Itachi with a Chidori
Example: He thought he could have killed Itachi with a Chidori