I have always been interested in the world of archaeology, so decided I'd check out this prediction. By the time I was done reading, I figured it would have already happened. The Mayans have a base 20 numbering system instead of a base 10. They have a 25 day month and 365 day year. If you figure out the actual year is 365.25 and they had no system for the partial day, it doesn't take much time to figure out that all those leap years that should have happened would already have made the"prediction" a thing of the past.
Then I read about the actual translation of the blocks -- according to an expert, the blocks were a story about two very important kings. Those kings were so great and powerful that in our year of 2012, they would still be remembered. Not that that was the end of all things and the world.
Not sure where folks get these half-cracked theories, but sure does make one wonder!