Midlist authors always had difficulties in B&M stores. Their paperbacks cost about the same as most bestsellers. Now they tend to be cheaper online often $1.99 as the Kindle Daily Deal. The midlist author is probably destined and/or better suited for ebooks. That's probably where their discovery and sales will be.
2012 was the year of the Bestseller. Fifty Shades, Hunger Games, Gone Girl and Diary of a Wimpy Kid ... 8 titles ... had 75% of all book sales in the US (print & digital). Not much room or interest for anything else. It's likely bookstores returned many quality titles last year and want to prevent such this year. Trick is in determining what will sell big.