Hey, if people decide to commit mass suicide because they actually believe that crackpot theory then I think we're likely better off without them here.
As for Obama... that's actually a good point. Considering how much so many Americans seem to be anti-Obama, they very well may equate Obama with the end of the world. Hell, they've already equated him to the Antichrist before, haven't they?
Chances are, it'll just be another Y2k and it'll come and go in just the same way. I'll bet money on that.
(And think about a bet like that. What could you hope to gain from betting for the end of the world? To make it more obvious: How do you plan to get paid/reap your rewards if you bet for the end?)