Board Thread:Theories and Speculation/@comment-25449165-20161013231440/@comment-734582-20161014161247

火影の意志 wrote: Naruto saved the world a second time in The Last, Kakashi must be real heartless not to at least promote him then. Naruto is virtually a god. Rank is pretty much meaningless to him.

I think Kishimoto said that Naruto being a genin-hokage would be a very naruto-thing to do. If i were Naruto i'd not change rank purely to go into history as a Genin Hokage, pure to make a point.