Naruto said he would bring peace to the world, Sasuke never talked about peace.. He talked about change, that is Sasuke's goal. To change the world based on the information he has in order to ensure that the same mistakes won't happen again. Naruto on the other hand is walking the footsteps of Hashirama, and will most likely make the same mistakes as him if he is elected as a Hokage. Naruto also shares the traits of Jiraya, and Jiraya also dreamed of attaining peace and he even wished to become Hokage at some time. However he refused that title, and he sought peace. Naruto isn't fit, needed or have any decent reason to become Hokage. Also if he does, then history will repeat itself, meaning that he will continue the circle. Something has to change, and that something is that the counterparts changes the seats. You can also take a look at the teams of Konoha and see an easy pattern;
Hashirama and Madara
Madara is refused as the Hokage, and Hashirama is made it instead. Madara also refused to become Hokage. ( Hashirama being alike Naruto )
Team Hiruzen
Jiraya and Orochimaru both wished to become Hokage, however Jiraya thanked no and Orochimaru was chased out of the village. ( Jiraya being alike Naruto )
Team Minato
Obito wished to become the Hokage, but lost the opportunity by his own choice. Kakashi was suppose to become the 6th Hokage, but Danzo stepped in. ( Obito being alike Naruto. However, later Kakashi and Obito switched roles and Kakashi become alike Naruto )
Team Kakashi
Both Naruto and Sasuke wishes to become Hokage.
Madara
Orochimaru
Kakashi
They are all alike Sasuke, and its easy to see that connection.
Hashirama
Jiraya
Obito
They are all alike Naruto, again easy to see the connection.
So lets see, everyone who has been alike Sasuke at some point has been refused or other wise never attain the rank of Hokage. While those that are alike Naruto either attained the rank or had the opportunity to attain it but they chose not to.. So if Naruto is elected as the Hokage, then the pattern will continue and the circle will continue. Which ruins Naruto's goal, his reason, his character and the series.