Usa wont attack Iran because Iran has become a huge ally with china & russia. Due to the fact that we are messing around with the caspian sea and have become good friends with unical(oil company) russia nor china will allow us to impede their growth process by taking claim of the world resouces of oil. So to your question will we invade IRAN, maybe but if we do mark my words there will be a lot problems that will accumulate because of this.