I don't think so. As Meengla said, Irán is also doing It. And I am pretty sure It is more difficult to re-stock THAADs, Patriots and SM3 than Emads, Khorramshar-IV and Kheybar shekan, among others.
In 60 days the United States cannot pull a new strategy out of its hat to bring down the Islamic Republic.
And Khamenei did It good. He just put the reformists in the front of the pictures, as you said. And if something really bad happens, they will be charged with the responsability.
We have an old saying that goes, "light a candle to God... and another to the devil." And Iran knows very well the risk of signing anything with the Americans.