Decent article, but trends in print book sales are irrelevant to ebook sales. So are trends in trade book sales, in my opinion.
Our markets do overlap here and there, but mostly they are separate.
The only interesting statistic in the article--and I'm not convinced it's accurate--is that some trade print books may sell under a dozen copies. Amazing, and this despite mass publication and distribution to bookstores nationwide. Although...do they really get nationwide distribution? Does Big Publisher A send two copies each to 500 bookstores and do nothing to support the title? Or does it send 20 copies each to five bookstores and let the rest of the 1,000 copies it printed sit in a warehouse until purchased by a remainder company for sale in the same bookstores next year for a rock-bottom price? Perhaps.
Regardless, I'm not in that game. My one nonfiction title sells continuously in the print version in wide markets. My fiction sells almost exclusively in ebook, both the books that are wide and the ones that are in KU. I have print versions available for all but my "box sets," but genre readers prefer the much more disposable ebook format.
So, do I care about the sad story of trade print books? Well, I do feel sorry for authors who have signed away the substantial portion of their rights to a big company that does little or nothing to sell their books. It's all on the authors. I hope they're happy being Officially Recognized REAL Authors.