Mayan Calendar: 2012?

My theory on the whole Mayan calendar thing is this... Imagine you had to create a calendar and your only device for recording information was stone. What would you do? You'd make sure the calendar lasts a very long time! No one wants to be cutting a new fifty ton stone calendar every year! The Mayan calendar is a lot like the Chinese Zodiac. They are revolving calendars, that way when one year is over the calendar can be reused the next year. It's a common practice in areas where communication is limited to horseback messengers or worse, foot messengers like the Mayans had. So the Mayan calendar recycles itself every so often.