If they do not remove Islam from the govt, it will not matter in regards to the rest of the world. The odds of removing Islam are slim and none.
That was the reason the mullahs were hell bent on overthrowing the Shah who was trying to achieve that goal and make it a secular government. Ironically enough, it was also something that was promised to the people to get their support for the 79 revolution. Once the Aryan factions were back in power, that promise was forgotten about and is one of the biggest points that unifies the self described Persians today.