Unless you can show me an example of the Rooney family hiring a retread head coach, it's actually quite a good one.
You simply miss the point that the Steelers hire good people and stick with them.
Hence Chuck Knoll 23 years, Bill Cowher 15 years, Tomlin 6 and counting.
In the Panthers comparitive brief history and numerous coaching changes, they are much different than the Steelers, however your retread comparison bears no merit..
Cowher was an excellent HC then, and at 55 would be an excellent one today.
His life was sidetracked when his wife died in 2010 of melonoma.
Should he decide to return to coaching I'm sure he'd have many suitors.
JR isn't likely to make such a move.