Iran recently aligned its banking system with Russia’s. The emerging framework of BRICS+ would make any international sanctions toothless. They are a major player in the new Silk Road project. They are already an economic powerhouse. With the crumbling influence of the US and the dissolution of Israel on the horizon, Iran has nothing to worry about.
And since you bring up 1979 – let’s not forget that it was American intervention that removed the democratically elected Prime Minister Mosaddegh in 1953 – and installed their puppet, the autocratic Shah in its place. The resulting student revolution to remove the Shah from power is what led to the current government in Iran.