*Shrugs* Anything could happen.
The Mayans also contributed to this theory also though. They marked or stopped their almanax at 12/21/12. I'm not sure, but whatever they did highlighted the date 12/21/12 for us. Blah, blah. We'll wait and see.
Well Nostradamus can well be just an example of one person's unique dreams, or "prophecies". It may just be pure coincidence in my opinion for the Holocaust situation. It depends on the person's view on someone. As for The Mayans, although they are surprisingly advanced, not even today can we predict an end to our system so precisely. The Mayans took a lot of items symbolically, I think 12/21/12 is, as it is, just an end to a very precise calendar.
I don't believe in it at all. The world was suppose to end on January 1, 2000 when all technology was suppose to stopp working. But it obviously didn't.