I hope e-books take off in a way that I no longer need a bookshelf, and no longer have to do my yearly cull *shudders*. That's the worst part, picking and choosing which books to either get rid of, or put in storage because I'm running out of space. With e-books I never have to think about that awful process again.
There's a clip in an episode of Futurama where Fry looks in through the window of the Library of Congress. On a table there are two discs, one says Non-Fiction, the other Fiction. Maybe that's where we're heading?