If capitalism "kills" art, then we should probably analyse at what point in history art was actually flourishing. The result will be that we need to restore feudalism.
I think the author is really complaining that opening something up for the masses kills art. It like pop music or McDonald's, they appeal to huge audiences but are not the peak of artistic expression.
It's a weird criticism that shallow things existing somehow negate or overshadow the increase in "deep/amateur/artistic" things that follow. Like McDonald's negates all of the food carts or Taylor swift negates how much easier it is for amateur musicians to get their music to you in the modern internet age. It's only an obsession with Nostalgia that could make you think that experimentation and expression in role playing games is somehow worse now than it was in the 80's, just because the biggest game is now owned by Hasbro.
