I think part of the reason, is a lot of western media has become very safe, and thus stale and repetitive. Western (live action) movies are sequel after sequel

I think part of the reason, is a lot of western media has become very safe, and thus stale and repetitive. Western (live action) movies are sequel after sequel of predictable plots. Western animation is relegated almost exclusively to children (and ocassionally raunchy adult comedy). The formula is stale, so other media is taking its place.