Jon Stewart was in several films and had a talk show on MTV as well as hosting a show called Short Attention Span Theater on Comedy Central (or it may have been The Comedy Channel back then-can't remember when the name changed.) So he wasn't an unknown at all. Plus, Kilborn had pretty much alienated a lot of people at that point, especially insulting Lizz Winstead, the show's co-creator in a magazine article. Kilborn was funny at first and had some good contributors on the show like Winstead and A. Whitney Brown. The show's changed so much since then you wouldn't even know it was the same show.