Around chapter 600 Madara reveals he left his real eyes with someone trustworthy to a young Obito. Now assuming that person was/is Nagato, and somehow when an Uzumaki/Senju gets the sharingan can awaken it to a rinnegan. Do you think Naruto gets his hands on a pair *possibly Sasukes as a last resort type thing (probably not since its gearing up towards him and naruto fighting for hokage or something like that) or even better yet Kakashi somehow talks Obito into turning good and knows that the only way to stop Madara/Juubi is giving naruto the sharingan so Kakashi puts his trust in him both surrendering their Sharingan to Naruto giving him a complete pair. Its a long shot but so far haven't seen it brought up in any discussions. What do you guys think?