CWOT and his colleague have returned to this issue, which is within the wider, global debate over the use of drones and the US strategy to pursue terrorism.
SWC has a long running thread on drones 'Using drones: principles, tactics and results': http://council.smallwarsjournal.com/...ead.php?t=7385

Building on their past work on Yemen and al Qaeda in the Arabian Peninsula (AQAP), Watts and Cilluffo revisit the use of drones in Yemen, offering context to ongoing debates about U.S. counterterrorism strategy as well as recommendations regarding the way forward. The authors review what drones and Special Operations Forces (SOF) have accomplished over the past year, explore why AQAP has continued to thrive, and explain what critics of drones misunderstand about operations in Yemen. Watts and Cilluffo go on to urge continued improvement of intelligence to better the accuracy of drone strikes, and argue in favor of greater transparency and accountability in drone operations. The authors recognize that "drones alone cannot entirely defeat AQAP," and call for the development of "a larger, long-run strategy...for pursuing U.S. counterterrorism objectives in Yemen."
Link:http://www.gwumc.edu/hspi/policy/iss...208_Drones.cfm