World of Warcraft market
A good example here would be the success of World of Warcraft that, as analysts explained to us ten years ago, has “vastly expanded MMORPG market beyond all expectations”.
Except it didn’t. It created a new market, World of Warcraft market, gathered new audience from other games in different genres, attracted quite a few people that haven’t played before, but
haven’t expanded MMORPG market much. There were no big successful MMORPGs after World of Warcraft not because WoW took all the audience, but because there were never too many people in “MMORPG but not World of Warcraft” market to begin with.
I think when you start thinking in terms of audiences for individual games instead of broad vague “MMORPG crowd”, “MOBA crowd” you’ll start to realize that sometimes a huge success of one big title doesn’t mean much for everyone else. It doesn’t expand existing market or destroy it, it creates a new one.