If it happens, like you said it's because he didn't come her to be a RB coach forever. I think the decision would be more about keeping him, than about finding the best guy for this job. This offense is in serious need of new, young blood IMO. Beck might be able to do that. I wouldn't be entirely upset if they gave him a chance at it. But, if Watson goes, then Barney and Gilmore need to go as well, because getting rid of Watson, and not allowing the next OC to put together a staff isn't fair to the next guy. It will be the same ol' sh!t. It's not like Watson got a chance to build his own staff...but that ship has sailed. The next guy MUST have that opportunity.
Who exactly would fire Cotton and Gilmore? Tim Beck who has coached with them for the last 3 years or Bo Pelini who is ultimately responsible for the defense, offense, and entire team? I agree that if Wats were to leave Tim Beck would become OC. I just dont see him becoming OC and then being allowed to fire anyone.