As far as C&R weapons go in the 40 years I have been collecting them I don't recall the prices ever going down. As the supply dwindles of any particular weapon dwindles the prices always go up. Just like the MN's are doing now. So I don't believe the prices on C&R's will go down.
On the other hand I have seen prices on AR's and AK's drop to pre panic levels on most of the boards I visit. On one site their was a NIB Rock River CAR M4 listed for $795 with no takers. Similarly so were prices on AK's, with no buyers unless they we well below pre panic prices.