Naruto is a descendant of the younger son , he'll never get the Rinnegan , because lets think about it :
If Naruto gain the Rinnegan , what would Sasuke have ? a SSJ ? lol
Kishi said that they are like the yin and yang , they will always be equal.
And to get the Rinnegan you must have EMS and Senju DNA.
Rikudou was an Uzumak
So you're saying Rikudou had an EMS?
Naruto to get the Sage's body by becoming Juubi's Jinchuriki, Sasuke to get the Sage's eyes, by obtaining the Rinnegan. That's what I think will happen. Sasuke will be the one to revive someone, if there is any revival at all, and he won't die.
So you're saying Rikudou had an EMS?
Rikudou was an Uzumaki. After he became the Jinchuriki of the Juubi, he awakened the Rinnegan like how Naruto has whiskers from Kurama, Gaara manipulates sand, Roshi can do lava style, jinchuriki's eye's change into their bijuu's when under influence of their chakra, etc