This is an interesting idea. I think the details really need to be worked out to common agreement though.
For instance, will the amount needed be a set requirement or will it vary depending on the luck of that particular territory? Will it be consistent for every territory on the map (as determined at the start), or be a territory by territory decision made when the game is initiated? What happens with neutral territories, should they rebel or should they be happy for leadership, or what if neutrals can basically be conquered without having to have more than one army, thus making some of the neutrals essentially non-rebellious?
I like the idea of territories changing thier allegiance after a certain number of rounds, but should this concept only be applied to neutrals, or to all "foreign" territories? Should holding a continent make the "locals" switch allegiance (I like this idea, but implementation could be tricky). I think the continent concept adds an interesting point in it being worth the effort to secure a contenental bonus, not just run across the board killing whoever you can get a hold of.
What happens when a person is eliminated? Do their original home territories revert to neutral or do they become home territories for the person occupying them at that point?
There are probably some other questions that would need to be worked out, but this is what comes to mind right now. I like the idea, I think you should update your original post with concise descriptions of the various scenerios that would have to be taken into account when implementing something like this.
