What does the end of the world even mean? There really aren't many predictions - at least imminent ones - that our entire Big Blue Marble will be atomized. Most predictions are for the end of some aspect of the world or other. And sometimes that means the end of our dominance as a species. Which I'm not sure would be a bad thing, although I'm really just musing here.
In any case it's kind of amusing that we still need to be assured that the Ancient Mayans aren't making spoooooky noises in their tombs about our imminent demise. If their work on the calendar was going to be taken as apocalyptic science fiction, it's too bad they weren't able to profit from it.