I think there is a huge market for large eink readers: the problem so far has been price point. I know lots of older folks that like HUGE laptop screens because of their ageing eyes now that such laptops are no longer a premium niche product (as they were back when the first 17" PowerBooks were launched). I also know a growing number of people, many of them in fact quite young, who have gravitated toward these huge ~5" cellphones and some who ever use +7" tablets as phones now that they are available and cheap.
I personally like screens small and high-DPI, but I think I'm probably in the minority, everything else being equal.
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