The real disruption for publishing is not the onslaught of self-published works in the marketplace; the real change is the consumers demand for short, more direct publications. Our attentions spans have shortened and this change is impact authors and publishers alike.
Since 1999, the best selling business books have shrunk by 23% (almost 80 pages) over the last 15 years. (I was rewarded with a long list of Atkins Diet and Oprah-endorsed books in researching the 1999 list).  ....