Just spitballing here - not going to pretend to be an expert on the middle east by any stretch of the imagination - but Iran has no reason to hurry. The Marine barracks bombings were nearly three years after the hostages were released and Buckley was taken five months after that. Iran has also been holding joint naval drills with China and Russia so there's likely to be some discussion of geopolitics beyond Iran/USA. The US doesn't look good here. Not even vaguely. Following that up with threats against cultural sites? How well do you think the rest of the world will be observing sanctions against Iran now? Making an unsympathetic attack against an American target kinda kills their momentum. If I had to guess I'd guess we'll see a mourning Iran, a bellicose Iran, a sympathetic Iran, but not a shooting Iran. Not until they can really make it hurt.