Dictator Ali Khamenei like Saddam Hussein before him is expected to fire all his weapons on Saudi Arabia mainly targeting oilfields. He is also expected to pour as much oil as possible into the Arabian Gulf causing an unprecedented environmental catastrophe. His final act would be setting fire to all oil fields in Iran and Iraq through the IRGC.
Saudi Arabia must act and protect itself from Iran. Currently, Iran has Saudi Arabia surrounded. On the north border there Iran’s proxies Hizballah in Lebanon and The IRGC in Iraq. At the southern border of Saudi, Iran’s proxy the Houthis are launching drone attacks every other week. East of Saudi Arabia and across the Redsea is Somalia under Qatar’s influence. Iran itself is located east of Saudi across the Arabia Gulf.
Iran will probably endure the sanctions until a Democrat is elected as president and sanctions are lifted. for now, under the Trump administration Iran is holding its expansion plans which could include Kuwait and Bahrain. The best way to deal with Iran is to increase the sanctions more every time Iran misbehaves to deter further misbehavior.
The only way to defeat Iran is through a coup d’état according to @mrubin1971 “The Islamic Republic’s old guard is dying of old age, and Supreme Leader Ali Khamenei realizes he may not be far behind? “The chief prerequisite for a coup is control of all or part of the armed forces, the police, and other military elements.” Currently, There does not like there is a military leader. However, Iranian opposition group called the Mujahedin e-Khalq (MEK) and Maryam Rajavi, National Council of Resistance of Iran (NCRI) President-elect. Once the Rouhani government is toppled these groups already have plans installed for a new democratic Iran.