Sure, it would send the price of oil sky high. But the regime of ayatollahs wouldn't last for long without oil income, and $150 oil is the best incentive there is for forcing the West to rely on other sources of energy, the development of which would be speeded up one zillionfold. The Iranians might send their 11,000 missiles to Israel in revenge. But that would be suicidal.
Islamist militants attack African Union base in southern Somalia (Reuters)
from the article: U.S. army chief: Iraq war has sapped ability to fight Iran