Interesting you brought this up. I just got back from vacation. We drove from MI to Avon, NC, about 1000 miles each way. Except for the truckers I didn't see even one CB or ham radio antenna on a vehicle except mine of course. There was almost zero chatter channel 19 except for the occasional radio check. I think the cell phone has taken over.
I haven't seen a ham radio antenna on a car or truck in months. I RARELY hear a trucker talking on 19 or any other channel for that matter. If I do hear a trucker it's usually a dump truck and after 2 miles they fade down to nothing.
If my radio is bleeding a few channels and no one is out there, am I still bleeding??? LOL