There we go, then.
I think that if your fortress was conquered by humans, a later popular revolt would make perfect sense. Having the dwarves revolting against their own nobility and tradition to form a completely new system of goverment? Not so much. If the dwarves were to revolt against your own leadership, say, overthrowing the bureaucrats and government officials as well as the noble houses and guild leaders, the new "government", as soon as a certain period of anarchy ended, would have a similar style of administration as the one before, even if the main body of the new administration was hadpicked by the revolting mob's own leadership. I see dwarven society as very proud and harsh about their traditions and laws.
I think that a truly "cummunal" type of society would only make sense if in the very beggenning of the game your dwarves revolted against the expedition leader and decided to make a little isolated comunity with only a couple of families lving toguether without complex government. In a larger fort, though, the pressig need for administration would come up pretty quickly. Sure, maybe they would even abandon the idea of a high nobility, but they would probably look for a central figure to lead them.
So my only real problem here is that I don't think this new appointed leader would try and implement, against all tradition, a proto-socialist administration. But to be honest it wouldn't bother me all that mcuh, as long as it was handled very carefully, and I can't even begin to wonder how would that be.