Whenever...it all depends on BP:
The only guys I'd be excited by from college are Pete Carroll & Chan Gailey.
The only guy I'd feel comfortable with in the pros right now is Norv Turner.
I know people will say I'm crazy, but Norv Turner is a great coach who did great things with a young QB in Dallas, was pretty successful with a team in Washington, and is doing great things with that offense in SF which was dead last season. His only failure was in Oakland, and I think we've seen enough in recent years to give him a pass on that. I like the idea of a guy who's proven himself with a young QB and running offenses.
I also think a great deal of Chan Gailey...coaches don't always do great in their first head coaching job. Gailey is another brilliant offensive mind who knows how to put points on the board, and now he's had more experience at Georgia Tech...he came in a little hamstrung with the aging and injured Dallas superstars who balked at a system change even though he had them putting up 30some points per game before the wheels came off. For those who want to keep making fun of him just because the team went from Chan to Campo, Chan Gailey was more successful in one season in Dallas than Parcells has been in 4. Chan Gailey actually won the NFC East in his first year as coach and was fired for an 8-8 season after that with extenuating circumstances.
I'm sure there are excellent coordinators who who would make great head coaches, but I don't know them, so I have to throw out the only names I would be comfortable with. I see absolutely nothing to get excited about in Jeff Fisher or some of the other retread coaches who haven't shown me anything exciting.
One of the guys some would consider would be Russ Grimm...but I say HELL NO !!! Having to endure a NY Giant coach in Dallas has been sickening enough for me...Jerry Jones would deserve to have his new stadium disappear into a sink hole if he ever hired one of the freakin' HOGS from Washington, no matter how good he might be.