I don't think this is specific to pre-War S&Ws. The gun market has cooled somewhat, especially as reflected by the auction sites like GB.
To answer the question, I'm 58 and while I have several pre-War Smiths, they are not my main interest. I am primarily a shooter, not a collector though. I'm not interested in owning a gun I couldn't shoot because of its collector value. I prefer the post war 'short action' Smiths when it comes to shooting, so that is my primary interest.
In much of the US, finding nice S&W revolvers at a local gun shop has become a thing of the past. It still happens, but it's far more rare. When you think about it, even a 1980s gun is over 40 years old at this point, and the popular market has been completely taken over by plastic guns. Auction sites are where the market has gone, and the nature of those sites has driven prices up to the point where many 'collectible' guns are very expensive for the average shooter. People of my age group are likely the last that had personal experience with revolvers when they were still prime-time, and without that personal connection it's unusual to become an enthusiast.
IMHO, the collector revolver market is looking at a significant cooling in the near future, just as the muscle car/ hot rod market went nuts in the early 2000s, and has since fallen off.