Interoperability of existing trunked systems for area-wide communications will make this work. We're doing it in Illinois with STARCOM-21. Price is an issue, but inter-departmental state-wide communications is now possible.
For tactical operations, like at the scene of a fire or police action, good ole two-way peer to peer radio works great. Low tech, grab a radio and go, put it on the right channel and you're there.
Bottom line, cool technology, might have some uses in some industries, but really nothing to see here. Keep moving people.
"Call immediately. Time is running out. We both need to do something monstrous before we die." -- Message from Ralph Steadman to Hunter Thompson