While a lot of people were reacting hastily in expecting dramatic shifts in US policy based on President-elect Donald Trump's campaign speeches, the talk from some analysts of the Iran deal being effectively dead because of the reaction results seems particularly premature.
Iranian President Hassan Rouhani was particularly quick to downplaythe risks to the deal, noting that as a multilateral deal between the entire P5+1 and Iran, no single government can practically overturn the deal. This has been a common misunderstanding by US Republicans seeking to derail the already signed deal with Congressional resolutions, and appears to have spread into the presidential primary.
While the US could conceivably renege on its obligations under the deal, and indeed that has been what some Congressional resolutions suggested doing, it wouldn't overturn the entire deal so much as render the US the sole violator of it. If anything, such a move risks an international backlash from the other P5+1 nations, particularly those in Europe.