The future is not written in the stone.
There are several possibilities to the hypothesis of the world's end in some beliefs because the way how they interpret the sacred norms in their cultures. With that being said, did you know that a long time ago, several people believed that the dreams were messages from the gods telling them what will happen and to this day, we know that the dreams are just reflections of our memories. So, there is a possibility that some Aztec people believed that the world was ending in their dream in the way how they see it. However, it is not possible to base the world's end solely on their dreams without any physical evidence that indicates the belief was true.
Since no one is right and wrong, all we can do now is to estimate the hypothesis of what will happen since there are no actual evidences to support our thesis.