From my extensive knowledge on the subject (watching every episode of Ancient Aliens), I feel confident in the assumption that this is nothing more than a new era, which would have been represented by a new calendar. I mean, who was this poor little Mayan dude who was expected to make calendars for centuries into the future anyway? Cut the guy a break. We are in the age of pisces and we are moving into the age of aquarius. For the Mayans, this was how they told time. They didn't have Breitling watches and iCalendar, they had stars.
Could I be wrong? Absolutely. Am I worried about December 21, 2012 and what might happen? No way. If some catastrophic event takes place, I have the hubs. He's like MacGyver. That's even better than John Cusack in a limo outrunning shifting tectonic plates, because he will rig me up a shower and make sure I have working firearms so that I might go into town and loot the Estee Lauder counter at the local department store.