depends really on what you believe in. I mean as a Christian, i believe the world is cming to an end, i just don't know when.
2012 if im not wrong are by the Mayans right? So if you are a Mayan, then obviously you would believe.
If you are an atheist, it's unlikely for you to believe in it because scientifically speaking, the Sun still has a few millions years more (correct me if im wrong) to live, an as the Sun live, we live on.