Fortunately most of those new books will be created using digital software so preserving them is much easier theoretically. Just have to convince the publisher to give them up.
Quality of information is a very important metric. Books have editors, proofreaders, fact-checkers. Online stuff not so much. As the value of a bit goes down so does the value of a collection of those bits.
There is also an argument to made that editors etc serve as gatekeepers to keep out "the wrong kind of people," which frequently correlates to the wrong gender, the wrong race, the wrong religion, the wrong social class and so on.
For some people, freedom to try to express themselves and/or freedom to hear others try to express themselves is far more valuable than whether or not the writing is grammatically correct and typo-free.
ps. amount of information in the world doubles roughly every few years, I wonder how that reflects on the number of books.