The Internet-versus-books debate is conducted on the supposition that the medium is the message. But sometimes the medium is just the medium. What matters is the way people think about themselves while engaged in the two activities. A person who becomes a citizen of the literary world enters a hierarchical universe. There are classic works of literature at the top and beach reading at the bottom.
A citizen of the Internet has a very different experience. The Internet smashes hierarchy and is not marked by deference. Maybe it would be different if it had been invented in Victorian England, but Internet culture is set in contemporary America. Internet culture is egalitarian. The young are more accomplished than the old. The new media is supposedly savvier than the old media. The dominant activity is free-wheeling, disrespectful, antiauthority disputation.
Right now…the Internet culture may produce better conversationalists, but the literary culture still produces better students.