I had a friend connected with defense visit my home for several days a couple of weeks ago. I expressed my concern over Iran with him, and expressed the view I did not see any way to take Iran's nuclear capability except a nuclear war. He assured me we can take it out with our new updated Tomahawk missiles.
You could take out Iran's nuclear capibility with MASSIVE conventional air strikes coordinated between the US, Britian, and the Israelis.