What is the drones annual salary? What is their annual housing cost, base allowance costs, VA medical benefits (lifetime)? How upset will your population be if one is "killed". Get the beancounters involved, and killer drones are going to be very tempting. For $75B per year or so (10% of US military budget) what kind of killer drones could I buy and how many?
The cost to deploy one F35 is astronomical. The training costs and lifetime costs for the pilots alone is heavy. The F-35 dedicates MASSIVE payload to life support for its human occupant. What kind of killer drones can you build with none of that mass, none of the gforce limits? None of the redundancy requirements? Do you need an aircraft carrier (thousands of sailors! -> needs destroyers and a battle group). No?
Can we design these to drop from space? Park 50K in space for quick de-orbit and insertion globally? Can you do this with people these days easily?
Going to be a scary world.
My quick guess is US, China, Russia, EU (maybe), India as places with enough capacity for this type of next gen battlefield? Maybe EU will move too slowly, so it'll be US / China / Russia?