I have heard that there's actually a lot of reading done on iPads, so I wouldn't be too sure that people don't read on tablets. I also recall reading surveys that do indicate that people read on their Kindle Fires.
http://news.investors.com/newsfeed/a...l-webcast.aspx
Tomorrow B&N will announce their 1st quarter earnings. So there will probably be more info then on how things have gone recently.
If there really is an iPad Mini, it's the end for B&N's tablets/LCD e-readers.