I wish they could figure out lasers and possibly rail-guns. The upfront investment is a lot, but the per shoot down cost hopefully would be much better. I wonder how much the iron dome missiles are per copy?
Real close to a working system now. Google "raytheon laser ciws"... As I under stand it, they've ganged together COTS (welding?) lasers and mated them to the radar and targeting system of the CIWS. I thought I had read/heard somewhere they had shot down "other stuff" besides the drone, but I can't find it now.
Look into THEL, M-THEL, the Nautilus laser project and the airborne Anti-Ballistic Missile Laser or ABL. They have figured them out and they do work.