Show me the Mayan text in which they're predicting the end of the world and I will kneel before you. Not the Tzolkin, nor the Haab (first is ritualistic calendar, second is the laic one) is mentioning about any end of the world. More than that, we are familiar with Mayan hieroglyphes mentioning the date we can calculate as our year 9898 - whoh, didn't the world end 8k years ago? Hmm...
Second of all, we're not even sure if the European monks were correct and they didn't made mistakes in their calculations, we might be already far beyond the magical 2012 date, probably our current date might be 2020 already - see, we're still alive.
Third of all, Mayan calendar can not predict the end, because it's not linear. Time in Mayan beliefs is circular, not linear, the end of one circle is the beginning of another, it can not end, it's very similar therefore to chinese calendar (as you might now, time in chinese calendar is also circular, not linear).
Third of all - why the heck 21.12.2012? Because it's an end of a cycle, that begun in 13th of July 3114 b.c.? Was it a "Year 0"? Not really, as I said before - there is no beginning in Mayan calendar, nor there is any ending, this date is considered as beginning of Mayan civilization, and in their calendar, it's the
ajaw 4 kumku, it can be translated as the 4th day of Ajaw Kumku month. So it's not zero

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What mr. Geryl is trying to persuade us to think is just another way of earning money. When the day 21st of December 2012 will come, mr. Geryl will dissapear on some tropical island with his fortune on a bank account in Cayman Islands...
So no, I'm not expecting any end. Well, I'm expecting nothing in particular.