If cigarette companies successfully combatted the information that smoking causes cancer for years, why can’t we do the same with Osama bin Laden’s purported tapes? Produce propaganda that outright lies, denying that bin Laden ever made any tapes after the war in Afghanistan. There only needs to be a few “scientists” to claim this, in order to produce controversy. As long as there is a perceived debate, people will be apt to believe that bin Laden is dead. It takes some of the “oomph” out of the War on Terror, but, oh well. Actually, if your goal is what’s in the previous sentence, there’s your ticket.
Advantages? Helps calm the American public. Sending out the propaganda now would go along nicely with Saddam’s recent capture. It could also put doubt in the minds of the international community, taking away from his message.