It is also possible that Iran’s reform-minded Green Movement will somehow replace the mullah-led regime, or at least discover the means to temper the regime’s ideological extremism.
It is possible, as well, that 'foiling operations' conducted by the intelligence agencies of Israel, the United States, Great Britain, and other Western powers—programs designed to subvert the Iranian nuclear effort through sabotage and, on occasion, the carefully engineered disappearances of nuclear scientists—will have hindered Iran’s progress in some significant way.
It is also possible that President Obama, who has said on more than a few occasions that he finds the prospect of a nuclear Iran 'unacceptable,' will order a military strike against the country’s main weapons and uranium-enrichment facilities."