We could bomb a little more than just their missile bunkers. Eradicating all remnants of a military and government would do the job nicely...ala iraq. We could decide later if we want to rebuild the place or not.
We're a little busy 'nation building' in Iraq right now, they'll have to wait until we're done there.
(and, oh, that might go faster if Iran quits arming, funding, supplying, and supporting 'the insurgents')...