The basic premise of Andrew Keen's new book, The Cult of the Amateur is that blogs and other web 2.0 tools have diluted mainstream culture by replacing paid professionals with the bungling attempts of amateurs. He cites the crisis in publishing and film production as examples of the way professionally produced content is gradually losing out to unpaid hobbyists.
All I can say is that my particular field; EFL/ESL the "hobbyists" are light years ahead of the professionals in terms of quality and innovation. English language teaching books have barely come to to terms with the 80's, let alone the twenty first century.
First broadcast on BBC Radio 4's Broadcasting House on May 6