For awhile.
However, with 1/3 of the worlds' export oil passing through there daily the price to Iran for such an act would be far, far more than they can bear.
Certain regime change. Loss of territory (30 mile "international zone" buffer around the area of Bandar Abbas). Destruction of ALL military capability. Seizure of oil fields to pay the bill.
Anyone remember the Carter Doctrine?
Yes, and because they knew our leadership of the time had no spine, the Iranian hostages continued to be held for about a year longer, until Reagan took office.
Do you think they fear Obama any more than Carter?