Right now I think he is a glass cannon, too much power for his body to handle. Like when Rock Lee said that Sasuke had his speed, but he couldn't uphold it for long because he had only been training that way for a month, where as Rock Lee's body was much more fitter and he had the body to sustain that level of speed. Now I see two scenarios growing out of this, combine SM & RM, which is very probable. The next deal is for Gai to be a bit of Naruto's teacher so he can get a more strengthened body, which isn't as probable BUT Gai's involvement into this whole island-chapter, fighting Kisame, getting hype again for his taijutsu..might make it happen so.