Its the year 2000 all over again! everyone thought the world was coming to an end, and the computers and tech would stop working, but they didn't and if you didn't buy that soft ware to protect your computer, guess what happen to your computer?
As well as 2012 is when earth Astronomicly moves to new section (or position around the sun) moving us to gemini(i think or aries) just like it happened and long time ago from pieces to taurus, an end of an era is all to begin a new one
Well while they were making their calendar, there was the whole business with the drought, famine, pestilence and civil war, so the human sacrifices would be rolling non stop. I guess all that combined might have stopped them making it.