if Naruto continues on like he is he will never become hokage, hes never going to be mature enough or smart enough to make the right decisions.

He got the crap beaten out of Hinata just because he was cheering her on, Sasuke also got the cursed seal because of Narutos decision to stay and fight Oro.
Naruto makes BAD decisions.
He doesnt have what it takes to be chuunin let alone hokage - strength isnt everything.

in terms of skill Orochimaru was obviously above Yodaime at the time thats why he was expecting to be chosen, its because the 3rd sensed evil intentions that he didnt get it - skill isnt everything.

personally Naruto is awesome as a character UNTIL he fights - hes way better just as comedic relief then 'insane fighter'.
whenever he makes some nobile speach it just doesnt sound right coming from him.

Naruto as hokage will decide to fight everyone that comes along, he'll never THINK first, even if theres other ways then to fight, he'll fight anyway. Quick way to die and put the whole village in danger.