Thats what I have been trying to figure out for the past few years. I dont know why it would just end at an exact point, but from what i know it does. Im trying to build my theories and expand these questions so maybe I can gain a better understanding for why. From what I have seen the Maya were extremely intellegent people, way past the people of today. I am also trying to gain that intellegence but through the same and similar practices, and teachings.