What if France and England had made serious threats of war when Hitler remilitarized the Rhineland?
Israel will do nothing to stop Iran from obtaining nukes. Possibly some covert activity to slow them down, but no military attack.
The US and the rest of the world will do nothing either.
We have already passed the point of no return here. Iran will have nukes, and we are just going to have to deal with it.
I hope I am proven wrong, but I think it is pretty clear now that the strategy is to contain a nuclear Iran, not prevent it.