As near as I can tell, this is a story of a population segment distinct from the elite embracing a new form of communication and the cultural changes that resulted from that embrace.  This story seems very similar to that of the story of writing in general and printing in particular.  In both cases writing began as the purview of the social elite and its use helped to cement that elite’s position and more generally to maintain the order of society.  Over time these technologies diffused, and cultural groups that were outside that ruling elite gained access to the same tools of communication.  What resulted from that diffusion was change, the more open spread of ideas which were different than those promulgated by the ruling class.  The results of such communication tools become available to the non-elite have had different consequences in different societies, but change of some kind has always resulted.  All that to say, Turner’s book may not be “wrong,” but it should be taken for what it is: one narrative among many in social history.  It is a story that has occurred before, and while telling it again is not unreasonable, seeing it as a remarkable anomaly is.