your presupposition is, that the USA has to intervene in these countries. Thats what I and many other are arguing against. Dronesstrikes in yemen are not a succes. Not at all.
Few people would argue against your point, that dronestrikes are better than a full-force ground invasion. Its a completely different topic.
Drone strikes are successful wherever they are used. They also kill innocents, but as I said earlier, there are far fewer casualties than there would be in a ground invasion and subsequent occupation. That, and they absolutely terrorize the terrorists, disrupt their ability to get anything done, and generally give them a taste of their own medicine. This is why we're likely to see far more use of drones in the future - lower cost/casualties and higher inflicted value over traditional wars. Simply put, the need to invade is lessened by the ability to utilize drones.