Great question. I think realistically I could see disagreements among the rebels about this. The heptarchate is not a great society either, but it's better in some regards than what follows. I saw the premise as more "preventing a dark future," perhaps with a side of "let's seed some reform from the beginning so the h*archate doesn't end up so awful," but I wouldn't rule out people with a philosophy of "let it all burn."

Does that help?