Yet it is also far from likely – even if Iran were to build a nuclear arsenal. In fact, say analysts and nonproliferation experts who have studied the effect of the bomb on countries, coexisting with a nuclear-armed Iran – or at least a nuclear-capable Iran – may well be possible, even inevitable, whether a military strike delays that outcome or not.
Analysts say Iran is not an irrational, suicidal actor that can't be deterred. Nor do they believe it is determined to destroy Israel at all costs. A recent Israeli think tank simulation of "the day after" an Iranian nuclear test came to the same conclusion: that nuclear annihilation will not automatically result.
Yet a nuclearized Iran would precipitate some profound changes across a chronically unstable region. Military balances would shift. Political relations among antagonists – and allies – would become more complicated. Israel would lose its nuclear hegemony in the Middle East.
Underlying it all loom major questions. Would Iran, implacable foe of the US and Israel, suddenly become beyond attack, like North Korea? Would Iran and Israel settle into a decades-long regional cold war, like that between India and Pakistan? Would Iran's jittery Persian Gulf neighbors rush to become nuclear powers themselves, setting off a dangerous and irreversible new arms race?