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I'll be the contrarian, then, and suggest that form factor is one current limiting factor, distribution of content is another, and closed platforms is a third.
As an example of form factor issues, why hasn't anyone stuck a simple solar cell on their ebook reader yet? With such a low-power device, it seems like a solar cell could take you from long life to "never needs recharging." And that would be a huge step forward in convenience.
Color will be a big deal when it arrives, but I don't think it's absolutely necessary for a successful product. Once it does arrive, though, I'm guessing all readers will be color within a product cycle.
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