More than one media mogul has been cautioned to slow down and take a break from the industry. But when Steve McPherson’s wife, Jennifer, gave the then-president of ABC Entertainment this advice, she was in fact reminding him of a pledge he had made years before, on the day they were married. An avid collector who in his youth acquired an appreciation for fine wine from his father, McPherson had given her his word that, one day, he would pursue this passion in a more meaningful way than by simply imbibing. In 2…