There's no mystery about what happened the the Mayans. Nostradamus didn't say anything about 2012, nor did he make any prediction that came true (you can hardly call his writings predictions anyway), and I can't find anything about this Merlin on Wikipedia. Speaking of Wikipeida, I'm only 20 minutes in and I think a quick skim through http://en.wikipedia....2012_phenomenon
would have allowed you to speak in a way that didn't spread various untruths even farther.
The thing with 2012 is, it was mostly spread person to person as a joke, like "haha, won't have to worry about that, since the world's ending!", but people hear it over and over, and some people end up believing it, and others exploit it to sell books.