Iranians are civilized people who want to live the good life, and spend money, not fight a war with the US or the West.
With Turkey going down the tubes into Islamism, Iran is ripe for a transition in the opposite direction, and we should be reaching out to Iran and trying to get them back from the dark side, not isolating and antagonizing them at every turn, like the Republicans have been doing.
If/when Shia Iran becomes a moderate or even secular state, that would send the message to Sunni states that they need to shape up or be left far behind.
We need to win on Iran, it can transform the Middle East.