The sports world is awaiting a ruling by the U.S. Supreme Court that could create a brave new world of regulated gambling on professional and amateur sports. A decision in favor of legalization would be a seismic event in an industry that supported the original gambling ban but has seen a variety of key figures expressing a change of heart in recent years.Gambling on sports is estimated to generate anywhere between $150 billion and $400 billion a year in the United States, most of it illegally.The Big Four professional …