Iraq was one kind of things for USA empire, it was a common war.
Libya was a new paradigm of war, a mix of color revolution and remote destabilization, no boots on the ground, and the job was done. Technology developed in the meantime, remote killings of drones, more information through internet and eavesdropping.
So they can do the same thing in Iran that they did in Libya: Bomb things, no fly zone, pay hitmen and so on.
Anyway, from a cold material point of view: It would be better for USA destroy GCC than destroy Iran. Because GCC is richer and more developed, more gains for USA if destroy them.