Why doesn't someone make a mod, or series of addons, allowing the player to fight as ancient civilizations; i.e Roman, Greek, Norse, Egyptian etc?
Now that bayonnets and Riot shield can be added to the game, swords and shields don't now seem impossible.
Perhaps the game could have mythological quests too and mythological monsters and heroes for a good campaign.
Then perhaps statues and buildings such as temples could be created suiting the time period and civiization.
It could turn Flashpoint into a 3D Age of Empires!