This is a great hypothesis but also seems a little far-fetched just due to the fact that you're concluding that the mayans could have predicted not only a date but human behaviour. As you said; everyone would be "nicer" and "change themselves", but how could any sort of previous civilization predict a species' nature and being, in thousands of years? I just don't see how a certain civilization could predict the futuristic "cycles" and their outcomes based on cyclic calculations. How were they to know at the end of this "cycle" we would need a mindset change, based solely on the fact that we expected it to be a doomsday. Great thread though, not against it, just flawed in my point of view.