Not just SEAD. Light attack drones + HARM + EW + forward deployed air defence is a new deadly combo with few counters, besides a massive strategic air counterattack.Drones are definitely the most efficient killing machines.
Cheap to replace and can be sent to suicide missions morally free. The perfect SEAD.
1 truck full of harpies launches 9 munitions. You need 3-4 F16s to shoot down then all, and it's not far away when a drone can carry at least 1 AA missile.
For a price of one F16, you can buy countless harpy trucks. Even a whole harpy truck likely costs less than one AMRAAM (I heard latest AMRAAM costs $2M).
I know US managed to have hundreds of planes in the air during both Iraq wars. A force on that scale would likely have no problem clearing a "harpy wall" with a concerted long range fire, use massive amount of jamming, and then go after the ground component.
This brings a question how to do drone operations of equally strategic scale to minimise "win by advantage", and how to deny such counter?