I don't think that paper books will exist for ever. They are more expensive than electronic books, they need much more space and often are rather heavy. It's unpleasant to read paper books when they become old and rather dirty.
I can see why some people think that computers will soon replace books. It's an inevitable process. If we have a look at the history of books we will see that they were the main sourсe of knowledge, but today everything has changed. We get much information using our computers. Computers take less space and can contain thousands of books, that's why they are so popular. In my opinion sooner or later the right place for paper books will be in museums! =)