How long when they become a part of the main game? There have been 4 years of development, 2 expansions, and 6 DLC before you got any non historical content. I think you are jumping the shark, while riding a horse here. Nobody knows what the next game is going to be, when or if there will even be one. And this is not a discussion of any future hypothetical game. Also it is clear as water that the devs have been extra careful with not adding any non-historical content in the base game. You are literally arguing on the air here.