The main idea of the passage is

Woman: Professor Rhinelander, nowadays, almost nothing causes more anxiety in the publishing world than the idea that books as we know them might one day be replaced by electronic, or e-book. Will books vanish in the 21st century?
Man: No, no. Books will still be around. According to my study, people aren’t interested in e-books. The market went nowhere in a year. The fundamental reason is that people who read books don’t have a problem with books today.
Woman: Are there any other reasons for people not to use e-books?
Man: Mm...regular books have clearer typefaces than computers, and they are lighter. Also, e-books have batteries that make them hot. If you are a consumer, how would you consume this?
Woman: This is interesting.
Man: There is more. If you read an e-book, you would buy a $300 device and download it and relearn how to read.
Woman: But a new generation of readers weaned on computers may not find it difficult to acclimatize to e-books.
Man: That’s true. But one thing that seems to be missing is paper, the feel of a book when you hold it, its grain, its whiteness. The sensation of paper is bound up in the experience of reading.
Woman: Some people who have read from a computer say it is a brand new experience. What would you say to that?
Man: I believe it is a new experience. But researchers have documented that during periods of total absorption in reading, there are changes in respiration and heartbeat. Computers, with their heft and weight, their lighted screens and distracting icons, interfere with that experience.