No I do not think the world will end. I do not think anything will happen that is not caused by the belief that something will happen. It may act as a sort of self fulfilling prophecy.
Many people believe there will be a shift in consciousness in 2012, the beginning of a new era in human development. For these people 2012 will start a new era because they believe it will.
Those who think the world will end are few and far between but there is likely to be some small amounts of damaged caused by a few of these groups or individuals.