I know Naruto wants to become Hokage, but I can't see that happening. If it does it will be the end of the anime. Logically he can't be the fighter that he is now. His movements will be limited to the Leaf. Rarely does the Hokages leave their village. To me he is still to young and naive to hold that position, understand where I'm coming from. Gara is young also, but he is wise and calculated. Shikamaru is the most obvious choice after Kakashi and I don't see Kakashi doing it either because that takes him out of the story line and limited to the Hokage desk.
Shikamaru was established as being to lazy for the job plus he isn't powerful enough, he is jonin level but being the strongest is considered the most important trait to be Hokage.
And there was Hashirama who was naïve and idealistic just like Naruto.
I suspect that either Tsunade dies or resigns and hands the position to Naruto, he still needs some more development but we have a year of manga left, plus the four Hokages are coming and I suspect one of the main reasons Kishi brought them back in was so that they could meet Naruto.
I think the Hokages are going to teach Naruto a thing or two about leadership and he will learn from their past mistakes.
He did say he wanted to be the greatest Hokage of all.