From the very inception of the War on Terror, this administration has attempted, both rhetorically and strategically, to present Al-Qa 'eda as a unified terrorist organization with a handful of supposed puppet-masters. Unfortunately, this assessment is tragically false. Global terrorist networks are fundamentally different in both structure and strategy than any previous threat to international state security. Unlike traditional warfare where power emerges from a single locus, Al-Qa 'eda is a radically individualized movement full of mini-leaders, self-starting cells, and zealous lone gunmen. The killing of any localized "leader " does nothing whatsoever to affect the actual power base any more than the ousting of Hussein did to staunch the threat posed by Iraq.
However, what this administration seems to have a difficult time grasping is that terrorism functions as an essentially populist movement where power derives from the bottom, not the top. There is no single government or leadership that will cause the beast to come crashing down but rather hundreds or maybe thousands of tiny, quasi-governments capable of acting with complete autonomy. Within such a network, Zarqawi no more represents the power behind Al-Qa 'eda than any other zealous individual motivated to strike against U.S. interests.
I believe it is infinitely more likely is that Zarqawi 's death will further inflame anti-Americanism across the entire region. Within the specific subsection of terrorists motivated by Zarqawi 's leadership, his death will only serve to create a localized power vacuum. In the face of his absence, it is far more probable that several individuals will vie to fill the void through independent operations, each more vicious than the last, in order to prove their merit. Absent Zarqawi 's leadership, whatever form of "command" he had over his followers has now been abruptly splintered and the U.S. will likely face a more diffuse and erratic level of aggression.
Were this administration to finally get serious about fighting this war, rather than playing the role of cowboy in a 'dead or alive ' posse, they would confront the ideology to which terrorists claim allegiance rather than the individual, armed expression of that ideology. In this way, perhaps the administration could cease inserting itself as a causal factor into the very problem is claims to be solving.