"Beyond the presidency, the more important position of Supreme Leader will change hands eventually, and probably sooner rather than later. All of these changes could bear on U.S.-Iranian relations, for better or worse. To the extent that the threat environment in Iran is viewed as high, it is more likely that Iranians will select hardline leaders. If the temperature should be decreased, there is a greater likelihood that the worst of the Iranian leadership will find itself out of power. This is only one reason among many that U.S. leaders should calm down the rhetoric on Iran and make clear that talks—without preconditions—are an option."