Wikipedia says that the movie is making political commentary, comparing the Iraq war to the Mayans sending people for sacrifice.
My thoughts on the Mayans, partly relevant anyway, is that some ancient civilizations vanished because they grew too fast, and used up the local resources. It seems to me that we may be facing something similar. We've grown very quickly, but it's not clear that it's sustainable growth. The predicted energy crisis, namely oil, is one facet of this. Everyone in the US wants a car. The Chinese want cars. Indians want cars. They're all going to need some kind of fuel. There isn't enough oil production capacity in the world to allow them all to run those cars.
Do we face an sensationalist apocalypse? No, I don't think so. Raised tensions in the near future over increasingly scarce resources? Yes. And I tell you too, as shortages arise, those in charge will say, "It's not our fault. No one could have forseen this."