And how did the Mayans pass on this 'knowledge'? In the 16th Century all written codices were destroyed and the teaching of classical Mayan suppressed.... in very cheery Christian ways.
We found a large number of books in these characters and, as they contained nothing in which were not to be seen as superstition and lies of the devil, we burned them all, which they (the Maya) regretted to an amazing degree, and which caused them much affliction.
The only significant work is not in Mayan, but Spanish. It was not intended to pass on past Mayan knowledge (as this was idoltry, superstition or devil worship). It was also highly inaccurate.
The main 'writings' we have are glyphs carved into stone or modelled in stucco. As these are not a 'written' item, they may have as much connection to the body of Mayan wisdom as the street advertising and billboards you pass every day.
What sort of a picture of life in the 20th Century would you get if this was all you had to go on? We had a god that dispenses food (Ronald Mcdonald), we all partook of a nectar that must have promised youth and immortality (Coke) and we shared the world with any number of fantastical creatures that left no physical trace, but must have been real as there images were so ubiquitious (Pokemon, Batman, Warcraft, Mickey Mouse, etc).
There never was a 'prophecy', because there was no way to transmit it. Any 'New Age' takes on this is just a way to separate you from money.