Define end. I am all for societal collapse. It would be a blast for me and my friends. However, I would rather it happened in the spring, my plan for survival is much more difficult in the middle of winter, although it's still doable in december. In some ways it might be better, but spring is overall the best.
Unfortunately, it won't. At least not on 12/21/12. I could actually see it happening. Lets say, some big earthquake hits somewhere, maybe even a tsunami. I can see massive numbers of people who the day b4 were like "ah, it'll never happen" running through the streets screaming "it's the end!!!!" and that might actually cause a big enough problem to break down society. For a couple of days anyway, it would all get fixed, but it would be funny as hell.
On the other hand, an end of the world or end of the human race would not be fun and I don't want them to happen. Not only do I like living, but I'm too young to even have a bucket list, much less start crossing things off it.