By personal observation only, I think prices bottomed out around mid-2009 when so many people, desperate for money, were emptying their closets and nobody was buying. They stayed down for about 18-24 months and started rising in late 2011 or early 2012. I did a lot of buying in that time and now have pretty much all the camera and darkroom gear I need and so haven't been watching.
With apologies to Will Rogers - Don't gamble; take all your savings and buy some good camera and hold it till it goes up, then sell it. If it don't go up, don't buy it.
I'm off on a major buying spree in a few days. However I'll only be buying cameras that I can repair. or restore.