The Mayans like all people were a spiritual people. They saw the future. They saw men in space suits as a future occurence not as a something that had happened in the past.
If you turned off your television, ipod, radio, and spent long periods of time in meditative spiritual introspection. Two things would happen to you.
1)You would have dreams of future events. Hundreds and thousands of years in advance.
2)You would be able to very accurately predict things that were going to happen.
All peoples have this ability; some have written down the things they have seen.
I don't know exactly what the Mayans saw in the year 2012 but I know enough about my own spirituality to know that something that has never happened before; something extraordinary is going to happen. The Mayans like a lot of early civilizations were unencumbered by the busyness of twenty-first century life so their minds were finely tuned and in harmony with the earth and the entire collective consciousness of the entire universe.
I'll just wait to see what they saw.