My dream is a game with the Total war battle map, like HOI only fully 3d with every unit there.
Then a Mod for it that covers the entire history of man with emerging factions, and such going on to the future.

It will never happen but it would be great

I mean imagine having your watch tower notice a aroching enemy army, and you despratly open the city menu and build a wall watching them get closer and closer

Or entiring a battle hopeing to hold them off long enough for your main army to arrive.