I really think either Ant or Opie leaving would kill it. Everyone bitches about Opie, but he really does make it a radio show. I agree though, just Opie and Jimmy can be boring.

If you listen to the shows with just Ant and Jim and for some reason you are uninterested in the subject, you notice how long they speak about it for. Opie really does a good job of moving this along and "tightening" the show. I'm sad to say it took me a long time to realize this.