That may have more to do with the fact that online booksellers can beat any local bookstore on price and they deliver to your door free of charge for orders over $25 dollars. Bookstores in general are being killed off by online book sales. That's one of the reasons they sell more than just books now, e.g., coffee, food, deserts. They know most people just come there to browse with little intention of actually buying a book.
So how do you explain non-computer sections that are the same as before or are expanding?