[fjtorres]

The one caution I have with these kinds of reports is that they don't report context.
In 2012 the ebook market was still growing very fast as ebooks spread into the mainstream from heavy readers to casual readers. In 2015 we have a much bigger market with most of the user growth coming from casual readers with smartphones and tablets who don't buy as many books.
The numbers quoted suggest that eink isn't as important without weighting the number of books each user buys (not all customers are created equal).
A year or so back, Nook reported that a very strong majority of their sales came from eink devices so the odds that 14% of phone-only readers provide even 10% of sales is pretty low.

I suspect a breakdown of ebook *sales* would show something like a 60-30-10 split for eink, tablets, and phones in ebook unit sales. And that is being generous to the phone-only readers.

If anything, those folks represent growth targets for eink.