and the trunking system is down.
Land lines down.... Until every public safety agency has every vehicle with digital, Analog, HF, VHF, UHF, Sat comm, etc. you get the idea.
Majority of your trunking systems will revert to single site trunking if they lose the master controller or communications to or from the master, or single repeater on each tower , most of your Counties have portable systems and comm vehicles they can deploy to a scene with an ETA of travel time.
By the time the majority of hams would deploy if requested , figure out how to actually program their radio, or screw around with FL digi etc, the incident would be 3/4 over.
We have a Nuclear Power Plant about 2 miles from here, every so often as required by the NRC, the 4 or 5 local counties that surround the PP have disaster drills. Listening to the County comms pass traffic, and listening to the local participating hams pass traffic, the hams are typically 45 minutes to an hour behind passing the SAME materials. If there were to be an Evac sent, I surely wouldnt want to be relying on the amateur network to get my evac notice ..................