Imagine if Aug. 19, 1953, had come and gone, uneventfully. Imagine if Operation Ajax, coordinated by the British MI6 and the American CIA, which toppled the flourishing democracy in Iran of Mohammed Mossadeq, had never left the drawing board. Imagine if the Western-educated Mossadeq, a charismatic leader who was massively backed in Iran by a burgeoning middle class, had been allowed to peacefully lead his country to become the first truly Muslim democracy in the Middle East. And imagine if his government had been allowed to assume its obligations and responsibilities, as stipulated by the 1906 constitution, and if the shah had been allowed to reign but not rule, as again stipulated by the Iranian constitution, and imagine if Britain and the U.S. had not been egged on by oil companies livid over Mossadeq's nationalization of oil interests in Iran but instead had stayed out of Iran's business and not intervened. Imagine what would have likely happened.
Had the coup never taken place, Iran probably would have gone on to build a sturdy, inclusive democracy that would have brought about a far more durable stability than what the shah--forever tainted in the eyes of his people as a weak, easily manipulated Western puppet--ever managed to deliver.
Had the coup never taken place, democratic Iran would have long ago done away with the myth that Islam and democracy are incompatible.
More important, nationalist and anti-colonialist as it was, Iran would have handsomely served as the model to follow for the dozens of Arab and Muslim states that had recently gained, or were about to gain, independence from colonial occupation, thus averting their alignment with the Soviet bloc as well as the rise of homegrown thugs and dictators.
Had the coup never taken place, the ayatollahs, who had supported the coup against Mossadeq, would never have gained their political clout. Indeed, the shah saw in the conservative ayatollahs the perfect partners against the radicalism of the left and the liberalism of the middle class.
Had the coup never taken place and the ayatollahs never been given the political clout they had enjoyed under the shah, the June uprising of 1963, which was fueled by the clerics' unhappiness with the shah's attempts at modernization, would also have never taken place.
Hence no harsh crackdown would have followed the uprising, nor would have a little-known cleric, a certain Ayatollah Ruhollah Khomeini, gained international attention as the spiritual leader of that confrontation against the shah.