Seriously, an Israeli attack on Iran and the subsequent fatal attack on Israel would set the Arab world back centuries. Iran would shut down the Straits of Hormuz. Any WMD attack by Iran or it's surrogates would destroy fellow Arab states of Jordan, Saudi Arabia, Syria, and Iraq. All Arab states would be in major crisis, particularly Saudi Arabia and Egypt. Forget about the passive governments of all the "stans" of the former Soviet Union.....they will look at the West and the Soviet Union as enemies. The EU will look at their Arab minorities as dissent within and century old hatreds will rise. The world economy will cease to exist. China exploits the crisis and the US will balk. the UN does nothing. I see a bad moon rising.
Keep your powder dry.