When you come down to it, the difference between a digital "bookstore" such as Amazon, Barnes & Noble, etc, and a physical book store, is nothing more than sales vs being able to *find* items quickly.

The electronic side doesn't have to worry about "organizing" their product to make it easy to find, say, books on the history of WWII in India, because you'll simply go to the virtual help desk (the search tool,) key in your terms, and be presented with a list of books (some not-so related.)  A physical bookstore needs to keep the stacks in order so that when you come in looking for the book, you know you'll find it in the "Military History" section.

The less-obvious difference, and one I don't think can be replicated in any way short of a full-fledged VR experience on the electronic side, is to get to the section you're interested in, in a physical bookstore, you need to also go past other sections.  So on the way to pick up your history book, as you pass through the "Hobbies and Crafts" section, you see an interesting cover and pick up a book on modeling in polymer clay, then go grab your history book and on your way to the coffee shop in the bookstore as you pass by the "Automotive" section you grab a book on "Zen and the Art of Porsche Maintenance."  How could an electronic site replicate that sort of thing?  I don't think it can.  I think even if, say Amazon, made a full-VR bookstore, they'd still use their algorithms to put books they think you'd be interested in, in more prominent places.  Essentially, they'd tailor their bookstore to each customer.

You have to wonder how much longer physical bookstores of any sort are going to be able to hold on against the onslaught of digital media (ebooks, etc) as us "old fogies" who prefer physical media to electronic begin to die off...