“… How, physically, will people read books in future? Will technology â€œunbindâ€ books, as it has unbundled other media, such as music albums? Will reading habits change as a result? What happens when books are interlinked? And what is a book anyway?”
I like the comparison with music albums. I don’t think the way we know books fits to any screen. Books developed along with paper quality and printing technology. When moving text to a screen infrastructure will have to change, it already did with hypertext.
For example you can leave out something you would normally have to explain in a book or other closed (and sealed) text. On a screen you just make a link, embed other media and update it. Hypertext and hypernarrative structures are how you navigate through stories on a screen. You make your story guided by hyperlinks and applications like search engines.
Books are bound to paper.