The problem with this logic being, drones aren't completely capable of replacing footsoldiers yet. The whole "nobody's won a war entirely with airpower" argument all over again.
The possibility of technology advancing to allow the creation of fully autonomous armies capable of occupying countries against guerrilla resistance indefinitely with dead "soldiers" meaning another check for the military-industry complex for another killbot rather than unpopular dissent on the homefront opens up an even bigger problem, what's stopping the state from turning said drones on their own people, rendering morale and popular will irreverent in an entirely different way?
en.wikipedia.org