The 12(6) prohibited class revolver & pistol market is in flux. There are some valuable 12(6) specimens to be sure and they *can* attract a considerable value, but mostly if you can find a suitable buyer & a motivated seller.
However, the vast majority of 12(6) pistols & revolvers IMHO are overpriced. Many sellers liken their value to the open market then become sadly disappointed when their firearm doesn’t sell at that price, & attracts lowballers. As for the future of the 12(6) classification, all the 12(X) categories will not go away or be reformed. If anything, the prohib class will expand. Stephen Harper & the CPC had six (6) years in majority government to fix C68 & failed.