I don't see it that way.
The biggest issue is the reality the next president faces. Obama has to tell the left what it wants to hear, but he isn't going to leave Iraq. The goal of Iran is to destabilize Iraq, and shut down their oil in order to force up the price.
The Joint Chiefs know this, the intelligence committees know this, and so will Obama when he gets classified briefings.
Osama is basically a side show right now. He's just hunting around for nukes and other unpleasant things for another hit on the USA. Or he's dead. If I was in charge I'd just bury the body and burn it and forever take heat for "not getting bin laden" rather than make him a martyr.
Iran on the other hand, will use oil revenue to start his own private WW3 in the middle east if the US leaves. Iran will rush in to fill the vacuum.