Cronos, the point is is that Rome in game will not always follow the same path, if it even survives, as in real life. Numidia could stay under control of Carthage, there is nothing saying that they will necassarily rebel and join the Romans. Rome could get conquered by Gaul, or by the Greeks, or whatever.
Besides, we have all of our factions done, and we are unlikely to change any of the set up.