The Civ series really is a goldmine for DLC opportunities, there are hundreds of small countries that could be added through DLC. The best part would be how cheap the DLC would be to produce, a few animations, some voice acting, and some unit reskins here and there. Shame Civ V had so little, they could make more Wonders, more Civs, more natural resources, etc. and I would buy all of em.
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I guess, but a Domination france would work so much better...
Like if (In Civ 5) The unique unit Musketeer could be kept, their unique ability would be replaced with the ability for post-industrial military units to build trenches (similar to Roman Legions building roads) and the Chateau would be replaced with another improvement, the aforementioned trench (also buildable by workers, for defense). They could even change up the leader, cause Napoleon is getting kind of cliché. Someone like Clovis I or Louis XVI.