There's already so much controversy over Glee's seemingly wholesome nature being at odds with its actual target demographics that I feel like it being a cartoon would cause the PTC to explode. If people need something in cartoon form to recognize that it shouldn't be taken at face value, perhaps they should steer clear of television altogether. Also, in cartoon form, I'm sure there'd be less prestige attached to opportunities for big-name guest stars, which seems to have become about one-third of Glee's reason for existing these days.