Will eBooks make midlist authors extinct?

By James McGrath Morris for The Huffington Post:

Digital books create a retailing bypass that diminishes the exposure of midlist books to potential readers. Supermarkets have long understood the importance of this aspect of sales, arranging their stores so shoppers have to pass through aisles filled with tempting items in order to pick up a quart of milk. So while eBooks will offer publishers an easier and more economic means to sell more works by leading authors it will increase the challenge of marketing books by others.