Everything depends on whether Tehran, and not just President Hassan Rouhani, is serious. No surprise, many analysts -- and more importantly, paladins of Capitol Hill -- remain skeptical. And that doubt has fueled efforts to impose new sanctions, which would impede if not kill efforts to reach a final accord.
It takes a lot to say that Senate conservatives have just made their most craven move in many years, but that's exactly what is happening. In an effort to force a vote on increasing sanctions on Iran, the Senate Minority is trying to attach the measure to an otherwise non-controversial bill that would help veterans, immensely.
There are two intertwined implications for the Gulf States and Israel in particular that a nuclear Iran presents: the physical and the psychological. Whereas Iran's physical possession of nuclear weapons can be neutralized through deterrence and containment, the psychological aspect will linger as it will constantly bear a high degree of uncertainty.