I think even my grandparents have heard of PlayerUnknown's Battlegrounds, the epic battle-royale shooter from Brendan 'PlayerUnknown' Greene. PUBG has continued its rise to the top with recently surpassing 1.5 million concurrent users.
As you can see from the graph above, PUBG's playerbase is rising at a rapid rate. It took 4 months for Battlegrounds to reach 500K conconcurrent players and build an established playerbase. In the previous 3 months we've seen the playerbase not only double, but triple to 1.5K concurrent players. Twitch viewers has maintained a steady viewing audience of 150-200K throughout PUBG's reign, peaking at 450K during the Gamescom Invitational 2017.
During a recent Reddit AMA, Mr. PlayerUnknown stated that he would "love" to add a single-player campaign to PUBG. Greene said: "I would love to add a single-player campaign to the game," he said. "I think the island we have could be a great location for an interesting story, but unfortunately we just don't have the time or the resources for this at the moment!"