As I understand it, the normal procedure for designating an entity as a terrorist threat, a terrorist organization, is a bureaucratic process. Mr. Horak should be able to explain what that process is, but it does require the collaboration of the different government departments to come to that conclusion.
I think the resourcing issue, quite frankly, is a bit of a red herring, for the reasons that I mentioned. One of the concerns—and I've certainly heard this expressed by some former officials—is that this would really prevent any effort by this government or a subsequent one to restore diplomatic relations with Iran, but I don't see that happening anytime soon.