i don't see why e-ink should not still be relevant. the bar here is to match ink printed on paper. strictly for text like those printed on novels where color is not required, e-ink screens look much more like printed text on paper than the same text viewed on a conventional tablet/phone screen.
as long as there is the want/need to replace something analog (book/paper) but with digital advantages, then people will keep on innovating. e-ink will be no longer relevant when there's better technology at reproducing ink on paper than e-ink. but at this point, that device would not be a conventional back lit screen.
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