My friend and his father restored Ford Model Ts, and today he has three. They peaked in theoretical value perhaps twenty or so years ago, and the collectors nostalgic for things of that era are all passed on. Same thing will happen to the currently overpriced '60s American muscle car fleet, as those who pined for one as kids age out.
Cameras could be similar, even if there's much less commitment compared to storing and maintaining an antique car. There is a bit of maintenance should one wish to shoot one, and getting a proper CLA isn't easy today.