I have to say how sad that after so many opportunities to understand that some still cling to millennialist spins and doomsday interpretations. Simply put the first author of what we now call Mark 13, anticipated the troubled times he lived in would escalate into the war of God. It didn't happen, and just as the author Daniel and many apocalyptical writers of the time felt confusion and disappointment. Some gave up their dark fantasies but others found ways to keep the delusion alive. Subtle rewording of the "prophecy" and dualistic hidden meaning are standards responses to desperation.
Ask yourself objectively, what good is a prophecy that no none understands? To believers there are endless collections of would-be prophecies. How is this different than those of Nostradamus?