Actually Thor, some version of that theory could make allot of sense, not to mention a great sci-fi movie. 
The one thing that is constantly failed to be pointed out, at least as far add the Mayan calender is concerned, is that by most interpretations, they didn't predict the world to end in 2012, that's just as fast as they had gotten. I'm sure to them, 400 or 500 years ago, they felt they had it far enough in advance at that point, and there wasn't any dire rush to work out the next cycle. Had they known about the spanish conquistadors arrival, and the 150+ years the would fight to defend their civilization, they might have gotten more of it done earlier.
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