Now listen to this, Naruto does not have to end up being Hokage. It has been foreshadowed that he will unite the world, among other things *I do not feel like doing research* So what if Naruto actually unites all the villages, big ones and the smaller ones. He could become the Supreme Kage or whatever you want to call it
However, he would still need Hokage, Raikage, Mizukage, Tsuichkage, and Kazekage because he couldn't personally be everywhere. *Shadow clones do not count !
* So that way Sasuke could become Hokage. I know it is far fetched, but if nothing else it could give someone inspiration to make a good FanFiction xD