I think that the real factor is how low the production cost of e-ink panels can drop with increase in volume and the maturing of the manufacturing process. At the moment, they are-- I assume-- still the most expensive component in an ebook reader. But I don't see any fundamental reason why they would always have to be much more expensive than LCD panels-- how much does an 6 inch LCD panel wholesale for? Five bucks? Less?
When we have $5.00 eink panels, we can have $50 readers.
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