As long as a game allows someone to run their own server, a community never truly dies. There are people who still play Half Life 2: Deathmatch and Counter Strike Source because we can run our own server
Ha. There's still people on CS1.6. I dip in a play a couple games every now and again. I found a server, not too long ago, that was running a full conversion Rocket League mode. Occasionally, you could see a flash showing that you're just a CT/T wielding a knife before the custom graphics load in and you're playing soccer with rocket propelled cars.