This would slow down Iran's ability to produce her own nuclear weapons. However, it would seal Israel's fate.
Israel would become a Pariah State to most other countries of the world. And it is likely that another country would supply Iran with operational nuclear weapons within a year or two.
Israel is already a Pariah in the UN and is surrounded by enemies. If the Izzie Chief of Staff says two nukes would wipe out Israel in the open press then who is going to condemn Iran for nuking them? The same ninnies that are negotiating or the UN who passes an anti-zion resolution every other day?
The opinion of the world didn't stop Hitler from killing Jews, the repercussions of an Iraeli airstrike against Iran won't stop the Israeli's from dropping the bombs. they know even the US can't protect them from this threat, we have no political or popular will to do so.