Containment of Iran?

This article looks at the scenario for containing a nuclear Iran. That is, if we go ahead and assume that Iran will get the bomb, what will our containment policy look like. Will "what worked with the soviets work with the mullahs?" is the question. The US worked to stop China from developing nuclear weapons in the 1960s but then slowly began to formulate a policy of containment after it became clear it would. So if China and Russia changed over decades, can Iran? The article lays out the argument for a containment policy. I have my doubts. We don't seem to have a clear policy towards Iran and are unsure, as the article points out, where our point of "tolerance" is - or, where that line in the sand is.