Great, you'd prefer to wait for them to call you?
Cell phones are limited by their very nature - dependent on a tower network that may or may not be there, and broadcasting to all units in an area in a usable way is a problem. Yes, keep your cell, but in an emergency, broadcast radio is the only option.
Understood ... I was only indicating the breadth of existing off-the-shelf technology that is available for full-spectrum (meaning types, not frequencies) communication. Consider that just about everybody and his brother has a cellphone and you don't need to outfit everyone with military radios. All you need to do is have a priority code scheme that gives LEO and FEMA priority access. That portable cell-tower unit looks to be rooftop deployable. The point isn't as much which mode to use but rather that there are lots of modes available. All it would take is the brains to realize at least one mode was necessary.