hrm food for thought.
Actually 2012 is more representative of the end of a time period that was within their understanding .. not the end of the world but the end of a cycle of time.
2012 is also when we will begin to pass through the galactic spiral as a planetary system. They expect all kinds of "side effects" from that.
2012 is theorized to be the end of many changes that will be the start of that "new time period" ( a Golden Age).
see http://hinduism.about.com/od/basics/a/goldenage.htm