... yet, the US is buying into the "regime-implosion" theory & seems to be driven by the "regime-change" argument.

Solomon in the WSJ/ here

"The Obama administration is increasingly questioning the long-term stability of Tehran's government and moving to find ways to support Iran's opposition "Green Movement," said senior U.S. officials...........

In recent weeks, senior Green Movement figures -- who have been speaking at major Washington think tanks -- have made up a list of IRGC-related companies they suggest targeting, which has been forwarded to the Obama administration by third parties.........

American diplomats, meanwhile, have begun drawing comparisons in public between Iran's current political turmoil and the events that led up to the 1979 overthrow of Shah Reza Pahlavi.......

Senior U.S. officials stressed in interviews this week that President Barack Obama isn't moving toward seeking a regime change (if it looks ... quacks ...then it is...) as its policy for Iran. Rather, these officials said, Washington remains committed to a dual-track approach of pursuing dialogue aimed at ending Iran's nuclear program while applying increasing financial pressure if the talks fail.....

"Do we expect the current government to be overthrown? I wouldn't say that at the current time," said a senior State Department official. "But a crack can certainly grow over time."