The real fun begins after 2012 when all the doomsday believers have to come up with excuses to explain why doomsday did not come.
There have been doomsday cults from time immemorial. The latest is the Global Warming(TM) religion. History shows that usually when the end of the world fails to happen, some of the followers drop off but the cult leader usually recalculates and comes up with a reason why they screwed up the end of the world calculation the first time and then it fails to happen again.
Usually thereafter, the cult continues in a diminished manner until the death of the cult leader.
Like every year that Global Warming(TM) fails to manifest or is only the result of an el Nino, we hear how cold weather is the result of Global Warming(TM) or "weather is different from climate" or any other manner of excuse. When there is a particularly cold winter, the GW(TM) believers fall silent until the first 80 degree day in July and they start up their preaching again.
The funny part with the Global Warming(TM) cult is when someone takes a boat for a cruise through the Arctic Circle because they believe Global Warming(TM) has opened up a passage and then they get stuck in the ice! Or eco-wacktovists plan a hike in the Arctic Circle believing all the made-up hype in the press about dying polar bears and have to cancel because it's too cold.
Yet, they continue to believe until the only excuse they can come up with is "The Oil Companies did it!"
I don't expect much more from the 2012 believers. I survived the 1982 Jupiter Effect. The 1999 Nostradamus prophecy. And the 5/5/05 earth tipping disaster. Not to mention Global Warming(TM) and numerous near-misses with space planetoids. Living such a charmed life, I do believe as long as I am alive on 12/21/2012 the world will continue. I am very lucky that way.
I can survive end of the worlds better than Barack Insane Obama can survive his middle name.
Oh, I almost forgot, I also survived the launch of Cassini! Truly I am a great benefit for the earth and all those who dwell here. And I don't even get paid any extra. Oh and the 8/8/88 falling into the sea of California. I am bullet-proof when it comes to end of the worlds!