Hmmm, I can't imagine Naruto as a teacher or as a squad leader. That would be a total chaos I think. But I think that all chuunins don't have to start doing either of those two? Well... I think he'll just keep training himself and then try ty raise step by step until he'll be the Hokage? Well, it's impossible to say how great will he ever become (I'm not a manga reader). I have a strong feeling that after the chuunin exams he'll just head to the Jounin exams (Of course only if he'll pass the chuunin test first, which I think he will do.)