I didn't say it was, just that there is a push and a chance, netflix is doing some good on that front, and if Disney participated it would help.
And I don't mean it is or will be mainstream and all of the west will all of a sudden be animation hounds.
But in a world and culture where until recently with only a few exceptions if you did adult animation it had to fit into either the simpsons/family guy half hour sitcom, or South Park/Comedy Central half hour gross out style, with the only real outlier being adult swim, where even then with the addition of other elements and shows in genres that were not explicitly comedy everything was still focused on being funny we are finally at a point where some companies are finding there is an audience for adult animation that isn't anime that is in other genres and played straight and so are putting the effort into making it, ie finding it acceptable to make since there is an audience that finds it acceptable watch, on the cusp since it's kind of in test mode right now and the success or failure of the shows will heavily play into if it lasts, best example being castlevania which has enough success to prod netflix into expanding the category.