Gerald Baker of The Times (London) thinks so.
If Iran goes nuclear, it will demonstrate conclusively that even the world’s greatest superpower, unrivalled militarily, under a leadership of proven willingness to take bold military steps, could not stop a country as destabilising as Iran from achieving its nuclear ambitions. No country in a region that is so riven by religious and ethnic hatreds will feel safe from the new regional superpower. No country in the region will be confident that the US and its allies will be able or willing to protect them from a nuclear strike by Iran. Nor will any regional power fear that the US and its allies will act to prevent them from emulating Iran. Say hello to a nuclear Syria, Egypt, Saudi Arabia. Iran, of course, secure now behind its nuclear wall, will surely step up its campaign of terror around the world. It will become even more of a magnet and haven for terrorists. The terror training grounds of Afghanistan were always vulnerable if the West had the resolve. Protected by a nuclear-missile-owning state, Iranian camps will become impregnable.
