Bill Parcells needs to stay retired, period.
The Big Tuna has a great coaching resume, and with his postseason success in the 1980s and 1990s, he has nothing left to prove.
It is, however, no surprise that franchises remain interested in Parcells because of his reputation, experience and success. That said, Parcells will be turning 71 years old before the 2012 NFL season kicks off and has been out of coaching since 2006.
His most recent stint was in Dallas from 2003 to '06, where he went 34-30 and 0-2 in the postseason. Those are certainly disappointing results, and Parcells has not won a postseason game since 1998 with the New York Jets.
A return to the sidelines would also bump his eligibility for the Pro Football Hall of Fame back another five years. And let's say Parcells does put the headset back on. There is no guarantee of success, and it's changed quite a bit since he was last calling the shots.
The NFL is now a pass-first league, and Parcells built his offense around the running game (i.e. Ottis Anderson, Curtis Martin). And although the ground game remains vitally important to winning, it's clearly not the premier philosophy to start games fast.
Also, in Parcells' three coaching gigs after the Giants he never remained for more than four years. Though coaching changes happen quickly these days, teams need a long-term solution. Parcells has taken time to rebuild teams as that is what ultimately lead to his consistent success.
He was with Big Blue for eight seasons and won two Super Bowls. Having only coached in New England for four years, Parcells lost in his third Super Bowl appearance and spent three seasons with the Jets directly after the Patriots.
Had Parcells remained with the Pats for more than four seasons or the Jets for more than three, it's reasonable to suspect that they would have seen increased Super Bowl odds.
Teams want immediate results from day one, and Parcells is nothing if not patient. Lest we forget about how Mike Ditka's coaching career finished with the New Orleans Saints from 1997 to 1999: a record of 15-33 and no better single season than 6-10.
Although we like to remember Ditka mainly for the 1985 Bears, that dismal time spent in the Big Easy is just another example of once retired, stay retired.
John Rozum on Twitter.