commonsense, don't worry about it. Yours is an interesting question worthy of debate. Some people appear to be more learned than others, but that doesn't necessarily mean they are. Never forget that ABers are anonymous and there are some who quite clearly hook chunks of information from the web or from books, and post it as their own work. Check the style of writing, and you will easily spot the tricksters. People are, of course, sceptical, but in reality who knows if this prophecy will be fulfilled? No one - and it doesn't matter how clever they are, or how clever they would like you to think they are.
Incidentally, I find it ironic that Christians continually tell us the end of the world is nigh, and yet they ridicule non-Christians for predicting precisely the same event. Odd that.