Remember; OUR calander is based-off the guessed day of Jesus Christ's birth.
The Mayan calander is based-off astronomical events. SOMETHING WILL happen... But we may only figure out what "IT" is, decades AFTER the 2012 "event". For example:People blame the "full-moon" on bizzar human/animal behavior, along with high-tide. Short of the whole Earth bursting into flames; Life-will-survive. In the year 2121 they will look back 109 years in the past and already know what happened according to the old gregorian calander on December 21, 2012.