I could imagine such a conversation some decades in the future, if and when I have grandchildren and they are old enough to comprehend the historical mistakes of prior generations.

The deal being discussed does not eliminate Iran’s ability to produce nuclear weapons, it enshrines the process by international agreement so long as Iran does not take the last step.

Recognizing Iran as a Nuclear Threshold State: Implications for Israel and the Middle East:

With shrewd strategic perspective, the Iranian leadership has weighed the long term implications of an agreement with the major powers that constitutes international recognition of Iran’s “right” to be a “nuclear threshold state,” and gives it the ability to break out to a nuclear bomb when it so chooses. Consequently, it seeks an agreement (even if its validity is limited to 10-15 years) that in addition to leaving it with access to its nuclear technology also rewards it with both removal of the sanctions and international recognition of its special status in the Middle East. The status of a threshold state will leave Iran with the possibility of arming itself with nuclear weapons within a short time span, when it decides that conditions enable (or in its view, require) it to break out to military nuclear capability.

Who will act against it at that time when Iran decides the time is right for the breakout?