Call of Duty: Black Ops 4
Call of Duty: Black Ops 4 is the least likely candidate on this list. Mainly, because there is a PlayStation 4 exclusivity deal in effect that gives people access to DLC before the other versions. But if it could get cross-play, it would be absolutely epic and probably make this multiplayer-only installment one of the most memorable. Imagine how long the shelf-life would be.