Not what I'm seeing: e.g., check the closing prices on recent SRT 101 auctions under the Big Tent. Nikon F100 bodies? Shocking!
True, though, that the days of 15 buck Spotmatics are over.
If anything Gresham's Law seems to be in play: junk's driving the gems into hiding.
Got my best deals off the 'Bay on medium format gear in 08-09. Still gloating about some of those...
There's such a huge reservoir of mid-market gear that "supply" arguments behind any apparent rise in price just don't hunt.