As we ponder if Iran will or will not succeed in its quest for a nuclear bomb, recent news from Libya, Egypt, Syria, Turkey, etc may suggest a more difficult future. Assume for a moment Iran does get a nuclear weapon, the next day all radical islam will rally to the accomplishment. Iran can then guarantee the protection of any newly formed Islamic state, by threatening to nuke Israel. Any weak regional government democratic or monarchy is then a target for destabilizing by radical elements.
Growth of Al Qaeda in Libya, Egypt, Syria and other marginal nations is perhaps in preparation for Iran's nuclear success. Recent arrests of military leaders by Turkey's Islamic leaning government is a step to weaken secular forces.
Ambassador Stevens and the Seal killed in Benghazi were working to find heavy weapon caches (i.e. 15K shoulder launched anti aircraft missiles) that went missing after the fall of Libya. There deaths may have had less to do with a video and more to do with radical jihadists preparing for a major regional uprising as soon as Iran takes the next major step in its nuclear ambitions.