I agree with your observations, Chris. They are correct, sadly. You can sense the trend even here, in this dedicated forum, and even in Dave's reply above. Dave has moved on to other guitars.
That is true not only for the guitars, but also the early Vox amps, the echoes (EFTP and TVS3 are history now), and so on. Even the posts here have in general drifted from That Sound and such, quite different from the enthusiastic, animated discussions of even just ten years ago (which is why I find myself re-reading the old threads).
That is true of old cars also, which interest me. The market for 1950s cars has dwindled, because the enthusiasts that knew them have died, gotten ill, or retired, concerned with things other than old cars. That is happening with 1960s cars, analysts say, and will continue with each following generation.
A friend of mine, a surgeon incidentally, has been trying to organize sessions for Ventures, Shadows, etc., players. He says, when he invites people, they are either on the way to hospital, in hospital, leaving hospital, or will lever leave the hospital. He says that to remind everyone there's not as much time as we used to think and therefore we should get together to play as often as we can.
I still have my early Shadows guitars (no Burns) and amps from the shows we did before. (I just found out one of the guys has a Marvin Burns, the only one in the country.) I'm traveling now, but will organize as many sessions as I can at home when I get back. There's not much time!
Andy