I like the way they point to the French Economist that predicted the fall of the Soviet Union 15 years before it happened as "proof" of the possibility that this kind of prediction has been laughed at before and turned out correct. My guess is that economists from all over the world were saying that USSR would 1) Control the entire planet or 2) cease to exist, with every possible month and year as their prediction. You probably had 20,000 papers by economists about the Soviet Union that were dead wrong for this one that happened to coincide with the actual event.
Similar to what Edi said - people have been saying this about the US for 30 years or more, so far they've all be wrong. This guy is only getting the attention, because he has been saying 2010 for the last 15 years, and now because of the economic situation we've gotten ourselves into, he all of sudden has credibility, that some other economist lost say ... last July, when his prediction turned out wrong. After 2010 passes, this guy will fade, but there are plenty more out there who have predicted 2011, 2012, and so on.