I take it you have heard the story of the boy who cried wolf? And furthermore, that you recognize its application to "prophecy" experts like Hal Lindsey whose theology demands that every major world event is the fulfilment of the same few obscure Bible passages, and who are consistently wrong?
My prophetic prediction is that John Walvoord's book Armageddon, Oil, and the Middle East Crisis will sell a few more million copies.