Actually I doubt we'll invade Iran. But I see a lot of infrastructure damage in their future.
Just make it a glass parking lot and be done with it.
I remain convinced that we never should have occupied Afghanistan or Iraq, either. That was the major strategic error.
Make rubble as many times as necessary for them to get the message.
And let them (if they can) spend their wealth and energy focused on emerging again from the stone age.
As many times as necessary!