It's a mistake to count on the same e-paper technologies be the only ones available as well. And you used the word "ever" - I'm just looking two decades ahead, at most. Readers, especially touchscreen readers, are useful for a whole host of things beside traditional reading as well.
And... you're making that mistake yourself - people read more than ever, but not necessarily novels. A tablet for the web is going to be a major, if not the major, platform. Also...sure, there are a few things which won't translate well, but future releases in that sort of unwieldy format? Well, they're few and far between already.
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