We don't need dedicated book readers. It probably would help make adoption more widespread (single purpose machines are generally cheaper).
What we need are devices that we can read from just as easily as a book, and are just about as portable as a book. The device can, and probably will, do more than just display books. Afterall, why not give it some general pda functionality so you have a calender and other useful functions? There is little reason to purposefully cripple versatility in any ebook reader, and I don't any ebook reader without a decent method of input will succeed--people will want to jot notes and such.
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