Oh, come on, he can be polite and gentlemanly and still make the show interesting. Anybody here watch My Little Pony?

The ponies could stop being ponies and still make the show interesting. However, the show is about ponies. So even though the show could still be interesting if the ponies were permanently changed into penguins, the creators are unlikely to do that. Similarly, Buffy the Vampire slayer would still be interesting if the supernatural events were ended and Buffy became a teenage detective like Veronica Mars, but the creator was unlikely to do that. Shows tend for the most part to keep being what they are about, even though a show about something else would still be interesting.