Re: Have we been here before?
AFAIK there's no good non-nuclear EMP weapons at the moment, but it is the most obvious line of defence against semi-disposable drones, and stands a good chance of being effective against missiles, aircraft and drones.
It quite possibly is, but you'd just be sending your own infrastructure back to the stone age too, which saves the need to bomb it in the first place.
It's likely that anti-EMP technology would emerge - outlying drones and an automated reboot 'should' work until something better comes along. The drone stops transmitting and the base shuts down for a second.
It might be worthwhile issueing every citizen with a blackwidow catapult and some ball bearings;. Should keep any low flying drones to a minimum.