Its funny, but both Terry and Howie were thinking the exact same thing. Howie was even calculating how much it would take to lure Jimmy back.
Jimmy quickly difused it all by saying "no, not me", but it didn't sound that convincing IMO.
Personally, I think this is the perfect scenario for Jimmy and his planet sized ego. Coaching a uber-talented team to the SB (just for half a season) would cement his HOF credentials and make him the undisputed greatest Cowboys coach ever. Not to mention, it would be a very gentle but clear "in your face" to his now buddy Jerry about who was the true driver on the 90's championship teams. If he fails, not his fault, it was just for 1/2 a season and he was only doing it to help out a buddy and the Cowboys (not his scheme, not his players, especially on D). Lots of built in excuses.
Win-win for Jimmy IMO.