Tom Landry, Don Meredith, and Tex Schramm are all spinning in their graves. (Roger Staubach is still alive, but if he was dead, he’d be spinning like a dreidel, too.) America’s Team has hit rock bottom. Jerry Jones purchased the Dallas Cowboys in 1989 and assumed the title of general manager. (Nobody realized it at the time, but apparently, it was a lifelong title.) The first head coach he hired — Jimmy Johnson — worked out extremely well. The early-to-mid-'90s Cowboys were disciplined, talented, and very successful. But Johnson only lasted five seasons. (He was fired after not drinking shots...