Walter Russell Mead has some great thoughts on what happens if America reaches a deal with Iran that successfully limits their development of nuclear weapons and lifts sanctions. Rather than looking at whether or not such an agreement is possible, WRM points out that Iran doesn't need nuclear weapons to establish itself as a regional power and exert a lot of influence on the world's oil supply.
Thus, the people in Iran arguing for a nuclear deal could be making a very realpolitik, power-maximizing argument saying that Iran should prioritize establishing a regional hegemony over acquiring nuclear weapons. Then, when the regional hegemony is established, the U.S. will be even less willing or able to oppose Iran's nuclear drive than it is now, and a nuclear Iran that is also a regional hegemon would have immense power over the world's oil supply. Iran's dream of becoming a true global great power would have been reached.
What's extremely troubling and alarming about the establishment press debate over the nuclear agreement with Iran is that the deal's partisans by and large simply don't engage with this absolutely vital and indispensable question. This is the kind of silence that frequently occurs when a political establishment is about to make a truly monumental blunder; history's worst decisions are made by people with blinkers on, who ignore the wider implications of the choices they are making and concentrate of a limited and narrow set of considerations. To think about the Iran deal solely as a question of non-proliferation is to miss the essence of Iran's national strategy and its potential consequences for U.S. interests. Americans need to know whether the administration has really thought this issue through and, if it hasn't, there needs to be strong pressure from Congress and elsewhere for a serious and in depth reappraisal to begin.
So how does this play out well for America? I hope some smart people are figuring it out.