So, at this point the US and others have firmly agreed on tentative points upon which there is no common agreement by either "side" in the negotiations. If the mantra of one of the parties (Death to the United States) prevails, there will continue to be a series of meetings to confirm the points of disagreement; following those meetings, the sanctions will be immediately lifted at such time as the agreed upon steps that continue to be disputed are verified. Barring said Death to the United States, the signatory parties will develop an agreement in perpetuity that expires in either five or ten years. Nevertheless, Iran will not have a nuclear weapon during the current US Presidents remaining twenty months in office, or for ten years, or until Israel grants approval.
Why even worry about the agreement when the US' real worry is the mental state of the dullard who believes all will be well in the Middle East?