Ill believe the worlds coming to a end when one of two things happen.
1, Nuclear war. (Optimistic thinking it will blow the earth up but shh)
2, The Sun super novas.
There my predictions, sure someone can predict the end of the world, but i can say the world will end tomorrow, it doesnt make it so.
We cant ask the Mayans about their calender cause there wiped out, so why believe it? Why couldn't their calender predict that they would be wiped out?