It’s probably been talked about before but I would absolutely invest so much time into a game where they took a lot of older-current weapons, perks, maps, and calling cards/emblems. It sounds SO ambitious and time consuming to be able to balance everything and fix issues from original games. But it would appease old heads AND introduce newer players to things they haven’t been able to experience. It’s very likely something like this would NEVER happen but it’s an idea I’ve been toying with for a long time.