Here's one reason we may see broadcasters make a seismic shift from airwaves to lightwaves (er, you know, fiber optic networks) in distributing their content. CBS Corp. reports that it makes 10 to 20 percent more ad dollars per viewer from its streaming content than from broadcast content. And according to its chief research officer, David Poltrack, that amount will only increase because: "Demand for our online video is through the roof." Variety's Todd Spangler has the details in this article.