I think the biggest factor that will likely allow e-ink readers to survive (maybe only as a niche market, but survive nonetheless) is the fact that book content being produced for the devices replacing it is in a format (largely) that works on them. For example, when DVD's started replacing VCR's, it ended up largely killed VCR's because the content moved strictly to DVD since there no longer was a mass market for Video Cassettes. At least currently you can use the exact same book on your tablet and your e-reader, so CURRENT (as opposed to just "back-list") consumable content is and will be available. That means it doesn't be as "obsolete" as say my VCR (and maybe even my DVD :-o) is for consuming new movie content.
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