So I was just reading about the rinnegan and it said that a person will be the destroyer or a person that will calm the world down, will that be Naruto?
No, then he would be just like Hagamoro, not Asura. He's supposed to be one of the two parts with Sasuke as the Indra half. If he had both the eye's and the body it just wouldn't work.
Idts. But then again naruto survived beast extraxtion, guy didnt die from 8th gate, obito stayed alive through pure will alone, and orochimaru is suddenly a good guy, so naruto obtaining rennin is not impossible.