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.
Eventually, the calendar is going to need to be redone. Even if it's only a few hours off every year then by the end of a millennium that adds up to entire seasons or even years off! (The so called "Experts" say the Mayan calendar is even more accurate then our calendars today. That's true on an individual yearly basis, but we have leap year to make up for our inaccuracies. And leap year was only invented to make up for the inaccuracy caused by daylight saving time, and idea coined by Benjamin Franklin not too long ago. Before that the calendar was extremely accurate. Far more accurate then the old Mayan calendar. Our inaccuracies are not flaws, they're chosen for good reason.) So eventually the Mayan calendar begins to lose track of accurate time. Without a leap year or annual daylight saving time this inaccuracy is inevitable. At this time the Mayan calendar seems to end. (It doesn't really but the inaccuracy makes it seem silly to continue.) That makes it seem as though the Mayans predicted the end of time to be on that date, December 21, 2012. Some people have asked me, "Then why didn't the Mayans create a new calendar that began where the other one left off?" A stupid question... How many Mayan Calendar makers are left in the world? None. Haven't been any in centuries! Who's going to make a new one? Especially with European colonialism coming in and the better calendar in use. Who the hell wants an inaccurate calendar from a dead race? No one. And how is it that these Mayan calendar makers could foresee the end of the world hundreds of years later but they couldn't see the extermination of their race only a decade away? People give these ancient civilizations way too much credit. They used to cut the hearts out of living virgins to ensure the sun would rise each day!?!? How smart were they really? No one ever said, "Hey, maybe we don't cut a bunch of hearts out today and see what happens?"