I wonder what the history channel is going to do now that 2012 was a fake.
My guess is that if the date is determined to be in the future, especially if it's 50-100 years, they'll shift Nostradamus' and the others' predicted dates to that year.. or possibly to a slightly later date, in order to keep the "End is near" hype machine going. Either way, they still have Nostradamus and friends' end of the world dates to rely on, at least.