Bill Belichick has gone a combined 233-79 since taking over as the head coach of the New England Patriots in 2000. During that time, his teams have made the playoffs in all but three seasons, and have been in the Super Bowl an incredible nine times, taking home the Lombardi trophy on six of those occasions. In addition to holding the title of head coach, Belichick has been given the authority over most football decisions in New England, effectively making him the General Manager.
Given the amount of success that Belichick has garnered during his time in New England, what would could possess him to consider leaving?