Sasuke DOES NOT want to become Hokage, he said that to Naruto as a joke because that's what Naruto always said. If anything Sasuke wants to erase the Kage positions and make them useless. So many people take this literally even though when he said it he had a smirk on his face and was looking right at Naruto, it was clearly just some joking around between the two which none of the other K11 understood, notice Naruto never made ay fuss about Sasuke saying it like Kiba and the others did because he knew Sasuke wasn't being serious.