It has now been one week since American Pharoah won horse racing's triple crown, the first horse to do so in an exceedingly long time. This singular event, like the long-awaited Mayweather-Pacquiao bout, was supposed to breathe life into a sport that has slipped steadily away from the limelight over the past couple of decades, and indeed, it did briefly wash up against the shores of the national sports conversation.