Umm...that every prediction in "The Late Great Planet Earth" failed miserably?
Actually, he's only an idiot if he's sincere. Given the money he's made selling books to the stupid and gullible, he may be a genius.
Read the reviews of the book on Amazon......
http://www.amazon.com/exec/obidos/ASIN/031027771X/002-9889005-7070429