[The Might]

Well, if that would happen, clearly Orcs would no longer serve Sauron, as seen in the discussion between Shagrat and Gorbag. However considering how Orcs usually act I doubt they could live together in a democracy, since each would want things done his way, and only his way, so eventually giths would break out between groups supporting different ideas. So, as said, you coudln't make all Orcs happy, perhaps only a part of them.