Yes, it's fully possible that someone like that can start a democracy. Once again, you don't know what Sasuke's revolution entails. You don't know the details. How do you know Sasuke's plan is to kill the Kages and Naruto because their influence is too great? What if the Kages and Naruto will have the wrong ideas that will create further chaos, but people listen to them instead because of influence?
We still have the possibility that Sasuke's plan is unification under a reasonable rule. However, what if the Kages, who are already leaders, prevent negotiations? One of you against Sasuke's way said it already, what makes you think the Kages are willing to listen to Sasuke? How do you know Sasuke isn't aiming to kill the Kages and Naruto so that there is no one who will stop him from proposing his ideals? How do you know Sasuke isn't aiming to kill them because he knows that they won't listen, and won't allow him to even say his ideals to people? How do you know people won't support Sasuke's ideals once he tells them to people?
You say Sasuke was willing to destroy an entire village, so his rule will be anything but fair, it will be a dicatorship. What about Gaara, who took part in the attack on Konoha that was meant to destroy the village, and stated how he wanted to kill everyone he came across just to feel alive? Is he a dictator? Nope. Not only that, but you're supporting him.
Sasuke can't be a leader because he was once part of Akatsuki, a terrorist organization, tell me, who did Oonoki hire again?
We are all ignorant to what Sasuke's plans are, so none of us can say whether or not it'll be a righteous success or an evil failure. All any of us can do is give him the benefit of a doubt. Whatever you say, at the end of the day, one thing remains fact: We just don't know.
