The only reason that eBooks have taken off so far is that we are already carrying around devices that can read them and it's very convienent to have something to read while we are unexpectedly standing in a long line at the store.
For eBooks to replace paper books they will have to come up with a technology that has an extremely long battery life and is very durable (i.e. water proof, shock proof). The technology simply isn't there yet. eInk looks to be the best technology so far, but it's not ready for prime time yet.
Today, the best thing is the "print on demand kiosk" that I've seen prototypes of. Bookstores simply become showrooms and will generate a book on demand. This should significantly lower the cost of paper books and increase the selection that bookstores carry.
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