As some comedian once said about the bankruptcy of the Psychic Help Line (Or whatever that damn' thing was called), 'You'd think they would have seen that coming...'
I discount the Maya 2012 crap for that reason. If they were so damn' smart, why did their civilization collapse even before Columbus and then the conquistadors showed up?
Most likely the same reason the great civilisations in America-North disappeared. Who were the Mound builders in the mid west, where did they go and why did they build these huge mounds that today we over look and thinking they are natural to the land until some upstart Archaeologist digs in and finds ancient pots one of a kind.
South West, the weird areas that some people used thousands of years ago to make shrines and sacred areas that still draws people into today. Who were these people --where the hell did they go to.
Much like the old time mining camps that are now ghost towns, people move on, the ore plays out, on to other places.
Climate may cause people to move on, drought and no maze can be grown, disease can and has wiped out large populations of city's all over the world.
Were do people go and why do huge civilizations just drop of the face of the earth???? Warfare could not kill everyone, had to be some other reason, we keep finding these Biblical kingdomes buried under the sand in the Middle east, some had thousands of people living in them, where did they go and why???
Hell we still do not know what happend on that island in the south that left only a cryptic word, that has to this day never been translated. Crouton ---or some such that I have forgotten through the years. Where did the people go ??
Who really built the pyramids the hunter gatherers who came or was the Spinx already there and Egypt took credit for building it but cannot explain why the did?
Many mystery's of the past, many huge kingdoms have risen and fallen for no known reason to us in the present.
A total coincidence that for hundreds of years the Mayan looked forward to their God who came from the Sky's to teach them how to plant and build, a white God with red hair, and finally on the year he was expected to return they saw these white sails and boats arriving with men of white skin and these awesome beasts they rode upon.
All was fine until the Gods from the East found Gold-----right behind them was the Church paddling as fast as they could to kill people to save their souls.
KAMA the Europeans with ships laden with gold and silver returned home but they also carried one more gift from the natives, SYPHILIS that was to in a way even the score.