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I think it is interesting to consider the number of books read over the lifetime of an e-reader device. For my prior devices it was enough to add far less than $1 to the cost of each book read, so I feel that I have gotten my money's worth out of those purchases. It is too soon to tell if that will be the case for my current, more expensive, device.
But I don't think that it is or ever will be an important ecological question. As I see it e-book readers are a declining niche and the number of e-books read on non-dedicated devices, such as smart phones and tablets, is likely much greater. The relative environmental impact for those multi-purpose devices is far harder to evaluate.
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