WIKIPEDIA - Maya Civilization.
WIKIPEDIA - 2012 Phenomen.
According to researchers of the Maya civilization that originated hundreds of years back and then existed as a culture for hundreds of years, this group never "disappeared" but instead just faded into the neighboring communities of other Central American peoples, seemingly about the same time that the Spanish arrived and began conquest.
I believe the Earth is in the "last days", before the wrath of God and finally a "rebirth" of Earth, when Jesus Christ sets up his throne as "King of Kings and Lord of Lords".
Though many New Agers and 2012 Doomsday prophets don't believe in Jesus, don't believe in the Bible, and don't believe in God, they very naively point to God when they believe that the Earth is pre-destined for a cataclysmic end on Dec. 21, 2012 (for example), and then a "rebirth" and apparently a transformation of humans (who must have survived the cataclsymic end) to a more spiritual plane of existence.
What this reveals is how naive many of these people are, who believe in 2012 and choose to reject God.
People who choose to believe in "prophecies" about 2012 are not getting their information from the Bible. They are being deceived to their own destruction and will find themselves in the "lake of fire" -- unless they repent of the lies and find the truth and salvation that is only available by faith in Jesus Christ.