Board Thread:Naruto Discussions/@comment-3568954-20140730070934/@comment-1210805-20140730123316

Naruto getting the Rinnegan would completely defeat the purpose of the Sage splitting his powers between Naruto and Sasuke. Everything that's happening now stems from Hagoromo choosing only one son to carry on his will. By dividing his powers between Naruto and Sasuke he has ensured that a) there will be no singular power and b) the two will have to work together, ending the ancient conflict between Hagoromo's sons. Give Naruto the Rinnegan and the scales tip way back.

Furthermore, the powers each of them gained are the ones that play to their long standing strengths and experiences (Naruto's mastery of Tailed Beast chakra and sage mode, Sasuke's experience with Dojutsu). The two don't really have the necessary skill to make use of each others abilities in a meaningful way. You'd also do well to remember that by having the chakra of the tailed beats Naruto already has something on his side that Hagoromo and his brother did not.