I don't know if they will go extinct, but they probably will become more of a niche collectors item.
As for whether or not I sell books, as far as I can remember I have never sold or donated any of my Trek books, and I have no plans to get ride of any of them in the near future. I have donated other books to the library and traded some in to a used media store. Generally they're either old books I won't read again, or stuff I bought and never read that I have no interest in anymore. But whenever I get ride of a book, I make sure it goes to a place where someone or multiple people will be able to read it. I refuse to destroy a book as long as it is still readable.
As for whether or not I sell books, as far as I can remember I have never sold or donated any of my Trek books, and I have no plans to get ride of any of them in the near future. I have donated other books to the library and traded some in to a used media store. Generally they're either old books I won't read again, or stuff I bought and never read that I have no interest in anymore. But whenever I get ride of a book, I make sure it goes to a place where someone or multiple people will be able to read it. I refuse to destroy a book as long as it is still readable.