To whether a mixed approach would be preferable in some ways, I think the answer is yes. I think there are particular tasks that the drones are better for, and there are particular tasks where the control of a pilot and the human interface is desirable. I'd be considerably supportive of that sort of approach.
Commonly it's thought that drones are good for dull, dirty, and dangerous tasks, so the long endurance, repetitive sorts of things in hazardous areas are perfect really for surveillance drones.
When it comes to applying armed weapons, I think that you're better off in the manned world, frankly, and that it's easier to assure yourself that you have the kind of control you actually want.