What is my theory on the Mayans' "end of the world" thing?

Why did the Mayans think that the world will end 2012? They were too stupid and uncivilized to live past then, that's why. Why do we care what they think? Hasn't anyone even noticed that there are NONE of them left? Mayans are ridiculous. They probably just ran out of paper and stopped their calendar at Dececmber 12, 2012. Mayans are dumb.