What does TV advertising do for TV writers? They pay their salaries, of course? But maybe not in the future. In response to a possible strike by TV writers, who are demanding they get paid appropriately for their work that appears on new digital platforms, producers are taking a hard line. So hard, in fact, that here's what Carol Lombardini, executive vice president-business and legal affairs at the Alliance of Motion Picture & Television Producers, wonders how long will television continue to be an ad-supported medium.