Iran forty years after its Islamic revolution is facing a grave economic crisis and growing popular discontent. It continues to commit acts that deepen its isolation even as it benefits from the mistakes of its adversaries. US sanctions are more punishing than anticipated but will probably not cause Iran to alter policies of greatest concern to Washington, such as regional interventions and ballistic missile development, and are instead strengthening hardline elements as Iran approaches a key political transition. Meanwhile, society has already undergone a cultural counter-revolution that aging ayatollahs cannot reverse.