Kishi already told us how Naruto will end
In the manga chapter 9 names, this is shown
http://www.narutobase.net/manga/Naruto/572/11
This leads me to believe that Sasuke will get Rinnegan somehow, he will fight Naruto and lose, Naruto will absorb Sasuke and in a sense become "perfect" (Senju + Uchiha + Rinnegan= Basic so6p). By then idk what will have happened to the tailed beasts, but I believe Naruto will become the Juubi Jinchuriki just like the Sage, however at that point he will have tamed all the beasts and from there he may split them up or they will live inside of him in peace because he is the true savior.
To me, this seems like the most logical ending, Tobi and Madara will be defeated, Sasuke will help Naruto become So6p, and then Naruto will show the tailed beasts the "right" path
