If naruto becomes fuhrer of the world it's just waiting for the generation that puts hitler (or obama or romney or whatever else dictatorial totalitarian idiot) into power..
That's not really true i think
What kind of power does the hokage actually have? The hokage does what the daimyou wants..
The hokage only assigns missions and protects the village and the land of fire as far as i know.
The hokage does hold the monopoly on power, but killing the daimyou will not go unnoticed by the shinobi of the village and you can't take the people's weapons (jutsu') so oppressing them will become hard.