naruto becoming hokage seems most likely since we now officially know, according to jiraya before death, that his father was the fourth hokage. look at tsunade, besides jiraya being the candidate, he's even said that she had right since her grandfather was the first hokage.
but will be become a direct hokage? (meaning if tsunade dies, will naruto take over)
well, naruto is still young, and at the same time, not one for the position, being the one to over look the work that tsunade does at the desk. sure, he has powerful justsu at his command, such as rasengan, shuri-rasengan and mass shadow clone, but would he be willing to take over the responsibilities that the hokage has... make more sense if he was to take over at a later age.
at the most, naruto is more likely to be a jounin or top chuunin, if that's possible with him still obsessing with chasing after sasuke.