I first became a vegetarian when I was nine, in response to an argument made by a radical babysitter. My great change - which lasted a couple of weeks - was based on the very simple instinct that it's wrong to kill animals for food.
Nevertheless during these two seasons, Chapman impressed me a lot because he had the faculty to pull himself out of the most critical situations.
The same issue is happening on a show like Everybody Loves Raymond now, which is in its eighth year and struggling to come up with good stories. It'll be interesting to see how they do. The bottom line is, it starts with the writers and ends with the writers.