How long before America attacks Iran?

Is a conflict between Iran and America inevitable at this point?

No, Iran is moderately well developed country which engages in a significant amount of international trade, it also has engrained democratic institutions, moderate opposition to the government does not result in assassinations and so forth despite riots and other disorder. As the global capitalist hegemony displaces Iran's primitive reactionary culture it will liberalise and in 20 years it will be a lot less hostile. If Mousavi mysteriously dies then we can start worrying.