I dont think CSGO is dying I think its just not as popular because of recent games like PUBG (Player unknown battle grounds) and Rainbow Six siege PUBG is basically Arma 3 and H1Z1 king of the kill all of them have slowly died in popularity ARMA 3 not so much as it is extremely diverse in its player-base and game-modes that it has to offer but PUBG is bound to die at some point it will loose popularity as it is the same thing over and over jump, loot, kill, die, repeat. CSGO on the other hand is more strategic but people I could see people leaving once they reach Global Elite because they have hit a point where its kinda easy for them but now they have the XP system and badges to collect more skins and maybe even ESEA so really CSGO has more to do and people are always coming out with new game-modes to CSGO so no I don't think its dying.