Electro-wetting displays seem ideal for an ebook reader. The greyscale version is brighter, better contract, and faster than eInk. The colour versions is brighter, better contrast and faster than colour eInk.
It's really a question of cost, I think. Perhaps Amazon would have the volume to make it worth-while.
So long as Amazon continues to use eInk with glass backplanes, there's probably not much to choose between them in terms of fragility of the display.
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