People collect all sorts of things that cannot be used, so the lack of availability of film will not necessarily be fatal to the price of cameras. Some cameras are nice things in their own right - exemplars of excellence in both design and manufacturing. I would like to have my Voigtlanders and Exaktas even if I could not use them.
Of course, supply is going to dwindle over decades. I can see my cameras going straight into the rubbish bin when I pop my clogs. So, I suspect we are at or close to bottom with prices, at least for the better designed cameras.