I don't think most would watch that episode either, especially with the amount of idiots I know confused that Family Guy isn't aired more, but that's the problem:
People see it and change to another network because of
1)Unfamiliarity with the characters/show
2)Confused by how "unfunny" this random "crap" is
While the fans will love episodes like this, tv is a game about the ratings, and with so much working against a random/casual viewer, it should be no doubt the people concerned with profits and product would find this a not too safe bet.
History is a nightmare from which I am trying awake.