Ok, some of these theories are WAY out of hand. For ONE. The Mangekyo Sharingan is an EYE, not a sphere that is hung in earths orbit. The moon is totally uninfluenced by the Sharingan until further evidence comes into play.
Another thing, I have NO idea why people always talk about COMBINING powers (i.e the guy who said Sasuke will get the Rinnegan along with the Sharingan). Sage mode and Kyuubi combinations like my avatar is something different. Sage mode can be used by ANYONE who can master the training, has guts, has what it takes to be a sage, a large amount of chakra etc... the Kyuubi is Naruto's Bijuu. THESE ARE NOT KEKKAI GENKAI. If in a future generation someone else is the Jinchuriki of the Kyuubi, the same conditions could possibly be met. However, the Rinnegan is a Kekkai Genkai possesed by Nagato and the Sage of the 6th paths. The USER of the Rinnegan is currently a body in Konans possesion. Those other bodies are probably not actual Rinnegans, more like duplicates used by the original body.
Sasuke is NOT getting a Kekkai Genkai that he does not possess unless he got ahold of Nagato's eyes, and we do not know if the same rule applies to Rinnegans as they do to Sharingans. The ONLY possible thing that I feel could happen where somebody gets a Kekkai Genkai that they do not possess is Naruto, because Itachi gave him "a little of his power". I highly doubt still that it is the Sharingan. Maybe he did a transcription seal and gave Naruto Susanoo. Those transcription seals are a one shot deal. We've seen Madara and Sasuke in the same room many times with Madara's Sharingan activated and Amaterasu only came out the first time.