They are bringing back "Classic" Servers for World of Warcraft sometime this summer. It will have a HUGE influx of players (at least temporarily). The hype for Classic WoW is unreal. They are bringing back a game that ate the lives of almost all who played it. Will the hype stay past a month or two after release, no. Time constraints on the audience who initially played that game is far different as the players will have moved into the late 20s and 30s but there will no doubt be a huge spike in players, far more than a normal expansion would bring.  Also, Diablo:Immortal which even though frowned upon, will be a huge success through micro transactions.  Look at the success of normal shitty made mobile games.  Activision (more notably Blizzard) has a way of polishing games to look and act a lot better than they actually are.  If you don't think they have anything in the pipeline then you are not looking at one of the most dedicated gaming fan bases in history.