yeah but the juubi would still be a weapon and would the juubi want to be sealed in Naruto, so it would treat everyone as a enemy.
People knows that Juubi is controlled, and if he knows Naruto as a Ally then he won't attack the others. Naruto would easily tell the army that it's not Juubi's fault because he could not control himself from being used. But this is the only possible way I can see Juubi being stop. There is no way that Naruto can get to the same level as Rikudou Sennin were and special not as same level as Juubi is.
And if he were sealed in Naruto what would the other do about it? They would just haft to accept it....
Please Sasuke-Fans don't tell me that he will be WAAAAYY op because he have Juubi inside of him. The only thing that would actually help Naruto would be faster Nature regeneration because if we look at the Juubi he only absorb Nature Energy and that would help Naruto with gathering Nature chakra for Sennin Mode.
Rikudou Sennin's body were never capable to use even CLOSE to ONE tail of Juubi's Chakra. So there is NO way that Naruto can use more chakra than Rikudou Sennin could.