I'm certain this idea has been floated before, but it's worth repeating. I'd like to see the splitting of civilizations in the event a capital falls or an empire falls into revolt. If I remember correctly, this was a feature in CivI or CivII.
Some of my most memorable games occured after my empire split and I had to fight a vicious war of re-unification.
To me it seems more realistic that an empire splits into factions after a capital falls. In the current design, the capital simply moves. It's actually a better strategy to surround the capital - cutting off its trade ability - than take the capital outright. This needs to be rectified in my opinion.
Some of my most memorable games occured after my empire split and I had to fight a vicious war of re-unification.
To me it seems more realistic that an empire splits into factions after a capital falls. In the current design, the capital simply moves. It's actually a better strategy to surround the capital - cutting off its trade ability - than take the capital outright. This needs to be rectified in my opinion.