These drones won't be sophisticated. They'll be cheaper versions of off the shelf drones. Quantity > Quality.
Imagine a drone that flies towards a cellphone signal and when it gets within range does some basic shape recognition and adjusts it's course to fly towards a the nearest neck until it detonates a crude fragementation grenade.
How much would a drone that can do that cost today? They don't need to be durable as they are meant for single use, and they don't need to be particularly fast, just faster than a person can run.
Imagine a drone that flies towards a cellphone signal and when it gets within range does some basic shape recognition and adjusts it's course to fly towards a the nearest neck until it detonates a crude fragementation grenade.
How much would a drone that can do that cost today? They don't need to be durable as they are meant for single use, and they don't need to be particularly fast, just faster than a person can run.