It doesn't matter who is the head coach of the Cowboys.
Nothing will change because the owner is still Jerry Jones and he micromanages everything.
Until the Joneses are taken out of the Cowboys franchise, they will never get to another Super Bowl, much less win one.
Jerry doesn't care if the Cowboys ever get to a Super Bowl or not.
People still pay money to go to their games.
He will still make money regardless - that's evident from the recent news that he just took delivery of a $250 million yacht.
Only way to make him change is to boycott the Cowboys, everything they sell including all merchandises, and for every one to stop going to Cowboys games.
Once his pocketbook starts hurting and he can't pay the bills for the death star in Arlington, the yacht and all the lavish parties he holds with his sons and son in law and their wealthy cronies where Jerry brings in the Dallas Cowboys Cheerleaders and pass them around to their future husbands and sugar daddies - then he will make changes like selling the team.