I truly fear that had Damar survived, he would've been very similar to Ulysses S. Grant, who was a brilliant general, but a terrible president. I don't think Damar was cut from the political cloth at all. His main goal in leading the uprising was in throwing the Dominion yoke off of Cardassia, not
in freeing Cardassia from its military dictatorship. Would he have been able to bend and flex, bow to the will of the people at large, or would the pressures of such have driven him back into the bottle, or worse yet to committing more acts of violence against people he perceived as traitors? It's very hard to say. I think his death served the story best, and it allowed him to go out on a high, noble note.