I don't think the writer of this blog post would accept "Netflix for ebooks." Netflix still has DRM, and you definitely don't own any of the content you watch on Netflix. For someone whose whole point is that they won't buy anything but a DRM-free epub to load into Calibre, I doubt that a such an alternative (which already exists, by the way, in the form of Kindle Unlimited, Scribd, or any number of library apps) would be an acceptable solution.