http://www.gcc-sg.org/index_e.html
Getting a group of Arab countries to act in concert is at least as difficult as herding cats. I doubt that they will act - much less effectively - together.
However - It would be nice if they took care of the problem themselves.
I think it more likely Iran will self distruct. Read FR post "Tehran's Killing Fields (talk about your offensive images)".
Be sure to read it to the end....if accurate (a big if), Iran is in very dicey shape and could be pushed into chaos. If that can happen before they get a nuke....so much the better.