Three experts on media and telecom weigh in on the AT&T and Time Warner merger. Scott Galloway, a professor of marketing at New York University, says we are at peak advertising and people will pay to opt out of advertising. Craig Moffett, a partner and senior research analyst at MoffettNathanson, says an AT&T and Time Warner deal won't result in cost savings. Rich Greenfield and Walter Piecyk, analysts at BTIG, say we are moving away from watching linear television and moving to an on-demand world with no commercials. Plus, Oliver Hart, a professor of economics at Harvard University and this year's Nobel Prize winner in economics, says he would ask about the efficiency gains of AT&T and Time Warner.