I love the Borders experience; is there some way "books + cafe" can work with some other business model? Maybe... an internet cafe, but with Kindles plus a book-binding machine?

Would there be any benefit to a virtual bookstore, where you can first-person-browse the shelves? Sounds silly, but you get some of that serendipitous discovery. It would probably need ridiculously high resolution for book spines to be readable from the distance one normally browses at.

Of course, all that could be done from home if you have an espresso machine.