I think it's just another theory about the end of time and like so many others it will not mean Armageddon but life will simply go on. I think the theories about December 12, 2012 is just another adaptation to events occurring in this time which when applied in a certain way does make sense but will eventuate to essentially nothing. Other examples include the year 2000 when some people though they should stock up on canned goods and the like, because the world as we know it would cease to exist... The theory behind that made some sense and did in fact add up, but nothing major happened. Like Gothmum said it's only really after the event that theorists come out and say "See Nostradamus, the pyramids or the weatherman said it was going to happen".