Consequences of air campaign to crush all possible locations of facilities linked to Iranian research program would include disruption of Gulf oil production and export severe and long enough to result in a new oil crisis and a global recession. This has been Iran's deterrent to such an air campaign and is not new. It's at present a guarantee that no such campaign will take place.
Will it remain a guarantee? Speculation is possible here: since we seem to be headed for a global recession no matter what, since destructive disorder in global financial system is a distinct possibility, what if the US decided that Iran's deterrent is no longer a deterrent after all?
What if the American government chose to
increase disorder in the global economy, aiming for a new "flight to safety"(*) towards the US dollar balancing a QE3 or QE4, at the same time as it would severely strike European, Chinese and Japanese economies?
US economic war against Europe and the Far East, through Iran? Hmmm...
(*) many investors continue to think the dollar is safe