I think that price is important when considering the future single-use devices.
Walmart sells simple calculators for a dollar. Everyone can afford one, and they are easily available.
I see that to be the future of simple eBook readers.
Sure, it's possible to imagine that simple eBook readers will be rare and so expensive that few can afford them, but that's an entirely different scenario. I don't think that it's helpful to imagine a scenario where an item is available only to the rich, and then say, "See? I told you they would still be available!"
Let me add that I think some here are making a mistake by equating simple eBook readers with eInk devices. The single-function aspect of a device is not dependent upon the screen technology.
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