It's taken me a while to realise but conquest modes are often the secret ingredient to some of my most beloved games, home to my most beloved pre-adolescent memories. I would very much like them to come back. There was a weird, brief time when it looked like they might happen around 2005, seemingly off the back of a wave of appreciation for Total War, when they started popping up in everything from other RTS games to the original Star Wars Battlefront 2.
Conquest Modes, I truly believe, are the best thing to almost happen to video games.