Being depressed by this is a bit like being depressed by pop because you think only classical music is music.
He's not stopping anyone from doing better art.
I wouldn't be into his art particularly but neither am I into the sort of paintings you see in national galleries either.
Really it wouldn't surprise me if he turned around one day and said the whole thing was a big joke.
He practically does just that here:
https://www.youtube.com/watch?v=6syZr_me_Bg
And, on a more serious note, pretty depressing.