Don Rassler and Vahid Brown argue in the affirmative (pdf):
The death of Usama bin Ladin will challenge al-Qa'ida and its long-term survival, and his demise has renewed debates about U.S. interests in Afghanistan and al-Qa'ida's presence there. While it is too early to know what the full ramifications of Bin Ladin's death will be, the ties between the Haqqani network and al-Qa'ida have remained just as close since 9/11 under Sirajuddin's command.
Barring any significant change, the Haqqani network will likely remain central to the future evolution of al-Qa'ida and its attempts to attack the United States and its allies. Poorly sourced accounts suggest that Sirajuddin Haqqani acted as the intermediary between Iran and al-Qa'ida to secure the release of a top Iranian diplomat in exchange for several al-Qa'ida commanders, including Saif al-Adel. If this account is true, it would again place the Haqqani network at the center of al-Qa'ida and its glboal jihad. U.S. efforts to dismantle and degrade al-Qa'ida today, therefore, are just as much about dismantling al-Qa'ida as they are about degrading the Haqqani network.
Colin Freeman reports on how the AWK assasination has affected the fight against this threat.
The Dish 