From Randi's December 12 Commentary:
Part of the problem is that the Mayan astrologers didn't actually predict the world would end in 2012. This is a common misunderstanding of the Mayan calendar by many in the New Age Community, which as I have posted before on this forum, does not end when the Mayan Long Count rolls over from 12.19.19.17.19 to 13.0.0.0.0 on December 21, 2012. No repair work or patching up of the original data will be necessary, since it doesn't support an end-of-the-world prophesy in the first place. When the prophesy fails to pass, the New Age Community will need do nothing more than admit they misunderstood the intent of the Mayan calendar.Mike Wood: The gist of it was that, as the Mayan astrologers predicted, either the world will end in 2012, or a large change in the world will occur between now and then ... I'm a great admirer of your work, and here's hoping it continues well after the Mayans say it will, although I somehow can't see anyone claiming the JREF million before 2012....
James Randi: Mike, when 2012 comes around, and the prophecy is not fulfilled, the nut-cases out there will begin the repair work, re-interpreting the original data and patching it all up.

the Mayan Long Count doesn't overflow its five digit representation until Friday, October 13, 4772, spanning a period of almost 8000 years: