"Nearly a third of all NFL head-coaching jobs could become vacant after the 2011 season. In addition to the Jaguars, teams that could (emphasis "could") make a change presently include, in no particular order other than the order in which I scan through the league's eight divisions, the Dolphins, Colts, Chiefs, Chargers, Giants, Eagles, Vikings, Buccaneers, and Rams.

So who will replace these coaches? Beyond Bill Cowher, Jon Gruden, and Jeff Fisher, there aren't many (any) obvious candidates.

Let's consider the three categories from which head coaches typically emerge: former NFL head coaches, current NFL assistant coaches, and college head coaches.

Former NFL head coaches: In the hopes of not omitting anyone (a sentiment that applies to all three categories), the list of former NFL coaches who could return — and who currently are coaching — includes Cowher (whose "plan" to not coach in 2012 could change dramatically if the Giants job opens up), Jon Gruden, Fisher, Tony Dungy (who consistently has said he's not coming back), Brian Billick, Jim Fassel, Dennis Green, Marty Schottenheimer, Eric Mangini, Jim Mora, Steve Mariucci, Brad Childress, Jack Del Rio, and Herm Edwards."