Ah, now, there's the rub isn't it?
If LBJ was right, Medicare would only be costing us about $3 billion per year right now.
If Al Gore were right all the coastal areas of Florida would be under water right now.
If Saddam Hussein were right, he'd be ruler of Kuwait (and Saudi Arabia) with a quarter-million bones of dead American soldiers laying in the sand.
If J.P. Morgan Co. were right, the Dow would be at 16,000 right now.
That predicting the future stuff is pretty tricky.