From Fallows's cover story, which is worth reading in full:
Online display ads may not be so valuable now, [Neal Mohan of Google] said, but that is because we’re still in the drawn-out “transition” period. Sooner or latermaybe in two years, certainly in 10display ads will, per eyeball, be worth more online than they were in print.
How could this be? In part, he said, today’s discouraging ad results simply reflect a lag time. The audience has shifted dramatically from print to online. So has the accumulation of minutes people choose to spend each day reading the news. Wherever people choose to spend their time, Mohan said, they can eventually be “monetized”the principle on which every newspaper and magazine (and television network) has survived until today. “This [online-display] market has the opportunity to be much larger,” he said. It was about $8 billion in the U.S. last year. “If you just do the mathaudience coming online, the time they spendit could be an order of magnitude larger.” In case you missed that, he means tenfold growth.