A couple of misstatements here in an otherwise interesting post:
A paper book last forever.
Before there was "bitrot" for digital files there was plain old "rot" for everything else, pressed paper books no exception. Those interested in the immortality of books need look no further than the library of Alexandria and the damage to the store of human knowledge done by its destruction.
A paper book can be read by anyone
Though very old, writing is a technology like any other. At a lower level on the technology stack you could say that "A paper book can be read by anyone who is literate and sighted." While it is true that ebooks require an electronic storage device as opposed to a paper one, those electronic storage devices are also capable of reading ebooks aloud, sharing information and culture with the illiterate and blind people in our own societies and preserving pronunciation and accent information for future generations.
In the Oxford University library in England, I found books in the old books room that were published in the 1600s. The persistence of paper books is an enormous benefit to all humankind.
Is the persistence of those particular physical objects what has enormously benefited humankind, or is it the knowledge and information they offer? While I can imagine scenarios where studying the physical books is of value to historians, I think we can likely agree that most of humankind will benefit only from the content of the books and will likely never know of or come into contact with the physical specimens in the old books room of Oxford's library.
What value then do books add to the persistence of human knowledge? Stone tablets are more durable and cell phones are owned in large areas of the geographic and socioeconomic world where owning a library is simply infeasible.
If we want to preserve knowledge, it seems to me that digital technologies offer us a larger scale, more ubiquitous, distributed, self-correcting, mechanism, for spreading and maintaining knowledge than ever before. While it is true that the current crop of format spats is making it difficult for consumers, the net effect is clearly in the right direction. And as all of the formats continue to converge on html, those incompatibilities gradually disappear and we are left with the native format of the web, which is the most universal and accessible format for displaying formatted text since the advent of printing.