I wonder if this growing schism might be impacted by the decline of shelf space in bookstores (
http://www.idealog.com/blog/future-b...re-publishing/), and whether authors are more inclined to protest in the genres where a majority of the sales are online? The 75-25 niches that Shatzkin mentions. However, it's hard to measure the shelf-space, whether it is changing, and how fast this may be happening.
I suppose we'll find this out if we see B&N attempting to strong-arm publishers.