I struggled with this earlier when talking to LittleBro. Let's assume Buzz wanted to leave - for whatever reason - to a new job. I think he could have resigned, spent a year in the broadcast booth, then be "lured" back into coaching, a la Dick Bennett. I don't care that Buzz said he'd be here as long as we'd have him (What else should he have said? "No, sorry, I may leave at any time."), but there are ways to leave a program without tarnishing your legacy.