If you were going to promote from within I don't think that there would be any need, for any of the current staff, to re-interview. What would be the point? Think about it. An internal candidate would know exactly who he wanted to retain and who would be expendable without any interview process.
Chicago thought they had a QB in Rex Grossman, Carolina had faith in Jake Delhomme. What does this have to do with the Dallas Cowboys? It just might mean that Tony Romo isn't what we thought and we may have to move forward without him.