Anyone remember Y2K? Man, civilization turned for the worse. We lost computers and our electronics totally screwed up. Our playstations and N64s ceased to function correctly and...wait a minute...that never happened! Y2K was a doomsday prediction and it never happened, so why should this one happen? Sure, the Mayan calendar ends in 2012, but maybe they just decided to say "fuck it" and stop there? There's only so much you can chisel onto stone slabs until you say its bullshit and stop working on it.
If 2012 is real, bring it! The human race will survive. If it doesn't come, then we'll laugh it off like we did with Y2K.