If 300 DPI was the limit there would be no distinction between the current line up of higher end Kindles, the Nook Glowlight Plus, or the Kobo Glo HD when compared to print on paper. So if you want to know if this applies to you, find a good quality print book and compare it to the ebook on your ereader of choice. If they appear exactly the same then congratulations you don't need to wait for eink tech to move forward. If the ereader looks better find a better quality print book. And finally if the print book looks better, you've just found out that 300 ppi is not a limit for you. I forget offhand just what the printed page is supposed to be in terms of PPI, but it's well over 300.
This doesn't have to do with how well you see either, I've got fairly poor vision and I still see a difference between my H2O and the printed page. Granted the H2O isn't quite 300 PPI but it's very close.
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