There are a million things that prove the theory wrong. First of all is that Mayans never believed in the end of the world, everything was circular and worked on a loop. Secondly another part has been found that puts the end of the calendar 7,000 years from now. Their calendar did not account for leap years, the fact the earth slows etc meaning that it would've happened ages ago if it was going to happen.
So no, I don't think the world is going to end. If I did I would've saved the effort of Christmas shopping haha xx