Do not worry, if Sasuke becomes Hokage, Naruto will become greater than a Hokage
Because simple is not said it WILL happen, but lets assume it does, let assume Sasuke does become Hokage, what does this mean for Naruto? If Sasuke becomes Hokage it means there is something greater for Naruto.
Naruto is hyped to be RS2, like it people or not he is going to be the successor of RS in strenght as well as finding peace, if Sasuke becomes Hokage Naruto will become something like a Sage that oversee all nations or something.
For all I care Sasuke can grab that little title of Hokage, if it does it only means Naruto will be beyond that, like the successor of the Sage of Six Paths should be.