As mshunt said, "I won't lose any sleep over it."
The Mayans have been known to make mistakes in their predictions, but they've also been right on the money.
It's an impossible question to answer, unless one has the "sight", I suppose. Obviously, even those gifted cannot be certain of the signs. According to the bible, many things have already come to pass.
My motto is "what will be, will be." I can't control it, much less change it. If 2012 is the end of our existence or the year of "a cataclysmic event,"should we see it coming, we can try to run and try to hide...Sadly, we can't yell "Beam me up, Scotty." If the human race and the world are meant to continue, they will.