"From a social interaction/party line standpoint the entire CB scene isn't as popular as it once was (thank you Compuserve and the Internet in general) but it still has a core group of users."

Don't blame the internet, that's a common ham fallacy concocted to explain away the waning interest in Amateur Radio. It's because of crowded band conditions that rapidly deteriorated beginning with the CB boom that made it nearly impossible to communicate even across town on any channel. Then the solar cycle peaked adding QRM from everywhere to the mix, every 10KHz from 25-28MH was jammed. There was such a feeding frenzy the sharks ate each other and CB never recovered. I was one, no sense having a radio you can't use so I sold my Heathkit twins (evil grin with horns) for a pretty penny, donated my Ringo to a camp for disabled kids where it was re-tuned and used on 10M and breathed a sigh of relief.

"Of which U.S. truckers are a dwindling quantity, having become disgusted at the outlandish and at times vulgar scene which they helped to create."
Careful, you know how to spell ASS U ME. From the horse's mouth, a ham/trucker, the FCC put the kibosh on trucker CB. You probably heard of the only mass enforcement they could make stick, camping out at truck stops and weigh stations and inspecting truck stop shops and cab radio equipment. Naturally they uncovered tons of illegal equipment and fined the truck stops for selling it and the trucking companies for having it in company trucks. (Possession is illegal regardless of ownership, connected or not.) They quickly got fed up and many banned all after market radios, some went farther and banned anything connected to the truck's electrical system so bye bye microwaves, refrigerators and the like too. For what it's worth I've heard of plenty of cases where CB and ham rigs caused RFI problems with vehicle electronics creating safety issues, a good reason for a voluntary self imposed ban so "the blue screen of death" doesn't become literal at highway speed.

"For nostalgia's sake try tuning CH5 (27.015) some time where there's a band opening to the SW. It's the Mexican/Latin American trucker channel and it sounds a lot like U.S. CH19 did back in the boom days."
Time for a Wall Of Voodoo!

I'm on a Mexican radio. I'm on a Mexican - whoah - radio
I dial it in and tune the station
They talk about the U.S. inflation
I understand just a little
No comprende, it's a riddle

I'm on a mexican radio. I'm on a Mexican, whoa-Oh, radio
I'm on a mexican radio. I'm on a Mexican, whoa-Oh, radio
Radio radio... What does he say?