[HEADING=1]Summary[/HEADING]
The Mayan calendar was designed to be cyclical, quite like our calendar which has cycles of various sizes very familiar to us, so the fact that the Long Count comes to an end in Dec 2012, while having some significance for the Maya as the end of a great cycle (much like we celebrated the millennium on Dec 31st 1999), does not mean that the
"world will come to an end".
It's also true that there are Mayan names for periods of time longer than 13 bactuns (the proposed end of which is supposed to bring about great misfortune to us), so that their calendar doesn't even end then.
Even if it did, there is
NO evidence to suggest that they (or anyone else for that matter) had any special knowledge about the end of the world. Why would they and how could they foresee the end of the world and not their own civilization?
Case closed!