I have not decided that yet. I'm not sure if people event want Geass itself in this. I'll let the majority decide my intention was a pure out Britannian civil war. However if the plot wants to Long may very well have had one due to his sudden rags to riches story, or even Crown Prince Kyle. We'll see how things roll out. But as I'd also like to point out/remind that geass isn't in itself a singular thing it can belong to multiple people.