A lot of people in this thread:
It's not about money or production, it's about attitude. Dez validated the problem when he took a flamethrower to Lee, Fredbeard, Linehan, and a few others. If you think that has nothing to do with him being unemployed I'll bet you've never hired anyone in your life. It doesn't even matter if some of what he said was correct.
To bring him back now, after all of that, would be borderline insane from a management standpoint. I'd like to think even the Cowboys aren't that stupid, but then Stephen Jones starts talking.