PUBG has done something not many games in early access can do. They have reached #6 on Newzoo's PC Game Tracker. It came in 6th in terms of players playing the title and in play time. Beating out top level games like WoW and GTA V. PUBG finished right below fellow shooter Overwatch, which as the graph below shows. It looks like Overwatch lost some of it's player base to this death match style shooter.
Pitting 100 players against each other in a battle royal style has paid off big in Japan. Where it ranks as the #1 game played. With many sources thinking that all of the players are being lost from Overwatch and moving to PUBG. I know I did. I just started playing this month and already I haven't updated Overwatch since.
PUBG will continue to grow. Newzoo thinks so and with an upcoming esports scene, not to mention upcoming updates. There are a lot of big named streamers helping by streaming the game as well. The game hasn't even been released yet. Though a full release is expected by the end of 2017.