Earlier quoted context omitted.
One answer, and I don't know if this is the right answer, is that unlike in previous revolutions, a new class of jobs has not been created to (fully) replace the jobs that are being displaced. In the industrial revolution, farmers could move to the city and get a job in the factory. In the (first) information revolution, factory workers could become telephone operators. But as Tyler Cowen notes in "The Great Stagnati…
As a support for your claim that new classes of jobs are not created , see pages 67-68 in http://www.thelightsinthetunnel.com/LIGHTSTUNNEL.PDF There's a table called "U.S. Occupations with at least one million workers (2006)". Every type of job there has existed since 1948. There are no new job categories created with over a million workers.
Jobs, and therefore people, have specialized more, that's all.