I'm going to get killed for this, but I've never thought Jerry was the problem. Over the past decade, player for player, position group for position group, I think Dallas has had the best collection of talent in the NFL. There was about a five year stretch where they were far and away the most talented roster in football. Some major kudos need to go to a GM for that. At some point, coaches just need to coach, and players need to produce.
I think they would have at least a couple rings with quarterback "x". Kitna could have gotten them a ring. There are probably at least 50 QB's that have played in the NFL in the last ten years that could have gotten a ring with that roster. They just happen to have Chokemaster Dufus as their QB. Should have gotten rid of him I don't know how many Decembers ago. That guy cost them an entire decade. And the funniest part, the fans STILL think "next year is the year Romo grows up and puts it all together". Dude is going to be 42, and people are still going to be saying "this is the year he grows up". Cut your losses, cut the guy now, get anybody else, and your chance of success goes up exponentially.
I agree with the thoughts on Cable. Being a successful head coach is usually about ego, confidence, and your ability to lead men. Quinn has a ways to go in my opinion. I don't know much about him, just listening to him in interviews. If Norton were going to create schemes and be a coordinator, he would have done it years ago. He loves linebackers, and seems to want to keep it that way. I'd be interested to see if Kris Richard could coach a defense. He seems to be the thinker of the bunch. I know a former pupil of his that just raves and raves about him.
I dunno about Bevell. Nobody does. He doesn't talk much. Sounds like a sharp guy, but doesn't look like one. Somebody will gamble on him at some point. But I'm sure being a former Wisconsin QB, he has to just love working with Russell every day. He just may turn down a bad head job. Doubt it, but could happen.