I must confess, I don't know much about CB's as the initial CB craze passed me by as I was a bit too young for that era.

In an emergency / crisis situation in medium to larger population centers, wouldn't the CB channels be as busy and thusly suffer the same difficult methods of comms as POTS or cell service would?

I would think that Ham radio would be a better solution in this case, especially considering how easy it is to get a Technician Class license now?
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock