I suspec that this will, like so many other things, be much ado about nothing. While Iran is not the happiest place to be, it has actually progressed significantly in the last 30 years, despite intense meddling from the West. No, it's nowhere near perfect or ideal, but it is more liberalized than our "allies" the Saudis.

If they develop a working nuke (not convinced that they will), I don't see it being any more of a threat than their other weapons. Their leadership is not stupid, nor are they suicidal. Even an attempt to deliver a nuclear weapon to Israel or the West would result in repurcussions that they know they couldn't live with.

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When they come a wull staun ma groon
Staun ma groon al nae be afraid
Thoughts awe hame tak awa ma fear
Sweat an bluid hide ma veil awe tears