At every video game event I’ve been to for the past six months, including this year’s E3, I’ve asked a wide variety of game developers about the future of single-player games. Even though we’re still getting enormous single-player successes like God of War, it’s undeniably easier to monetize multiplayer experiences, and I think that’s how this fear of the “death of single player games” has shown up in pockets of the gaming community. The notion even goes back to 2011, with Mark Cerny, lead architect of the PlayStation 4, saying: “Right now you sit in your living room and you’re playing a game by yourself – we call it the sp mission or the single-player campaign. In a world with Facebook I just don’t think that’s going to last.”
Source: IGN.com Devs Say Twitch is Hurting Single-Player Games