I think, that a future game of TW series shold be about a post-apocalyptical fictional world with factions derived from our modern nations, who survived an will struggle to dominate the neo-medieval world.
I think that kind of game will be THE BEST EVER from the Total War Series and the people will enjoy it.
The gameplay can be similar with the other TW games, campain map wouldn't have to be so different, some futuristic tipes of settlements and forts and buildings, and in the case of units, we already heave musketeers, artilerry and skirmish units, and perhaps even some futuristic verion of cavalry could be maintained, because in that future the oil would be spared only for very powerful machines so if an army wants mobillity, i think the cavalry will reemerge
I hope I contributed with a good ideea....
