I think that physical books have a lot of advantages... one of the greatest being that their batteries don't die.
I envision the books of the future as being a combination of physical, paper books and electronic books. They might even be real, bound books with electronic paper, so you can have one "real" book that can hold thousands of electronic books, so you can have the convenience of e-books with the feel of paper books.
"Always forgive your enemies; nothing annoys them so much." - Oscar Wilde
ďDo to others whatever you would like them to do to you. This is the essence of all that is taught in the law and the prophets." - Jesus