I wonder if Iran agrees to be bombed and to do nothing in return. It's not like Mullahs weren't warned years in advance.
At the very least the Strait of Hormuz will be mined and blocked, made not navigable by tankers for years. At the next level of response Israel will be seriously hurt. At the next level of response Iranian operatives abroad will carry out major acts of war - against the USA and against every other country that joins in. At the final level of response Iran will use the nukes that they have against pretty much anyone. Even "dirty bombs" can be used - and Iran has plenty of nuclear waste.
Not going to happen. Blocked for 72 hours maybe, and then cleared. After that it would require convoying ships through, but the Iranians simply couldn't blockade it for much longer than 3 days. Their air force would be gone, their navy would be gone, and their coastal missiles would be shot down (they don't have great ASCMs).
After that they are down to throwing free floating mines in the water and attempting suicide runs with small boats. A hundred attack helicopters would effectively take the small boat threat off the table and the floating mines are manageable. Not to mention that when Iran closes the SOH, they also choke their own throat and have the honor of being on the receiving end of an extremely effective naval blockade.
All this will happen in any case regardless of what we do or don't do.