I disagree, perhaps only because of hindsight with a year of further developments, though I think Iran itself is not unlikely to crack down as part of the considerably warmer cooperative relationship with the US they've developed of late. Giving the US cover while it achieves majority (i.e.: Shia) rule in Iraq will deliver to Iran much more geopolitical power and cred than backing bombers and charities in the OT ever will, and if the US wants some crackdowns on Iran's pet terrorists in exchange for not frustrating Iranian influence over a democratically reconstituted Iraq, I would wager the mullahs would oblige and consider it a good deal.
