I don't think it's been mentioned in this thread yet that e-Ink screens only draw power when turning the page. That is a super cool feature, and means that multipurpose tablets will have a job becoming as energy-efficient as dedicated e-readers, if they can achieve it at all.
That said, most people don't care about energy efficiency or even consider it, so it could well be that Kitabi is right and tablets will become the preferred mode of e-reading.
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