Naruto would be OP but... WHY NOT?
He IS the main character and So6P descendant, I see it highly possible.
I think he will get it after achieving the other half of Kurama's chakra and SO6P will show 'inside' of him. There will be some chit-chat about history and "the answer", that will lead to a true peace. After that conversation, Naruto will find the answer which will affect some villain (like Pain), maybe Sasuke or Obito.
The other thing is, that he will look weird with rinnegan...
What do you guys think about that scenario?