It seems to me that sales of SXS guns, particularly 12 ga, have really slowed in the last five years. Maybe it is a continuing slow down along with the aging of the US population...Whta,s your experience?
Mere perception can be misleading without actual nationwide completed sales data. Take for example the Nutty Professor's perception that Trump would lose, and that he was going to get slaughtered in Iowa... according to misleading polling data, and wishful thinking. Sometimes figures lie, liars figure, and Trump Derangement Syndrome makes Liberal Left gun owners look pretty dumb.
On the internet gun auction sites I follow, there still seems to be a respectable number of bidders and buyers for 12 gauge doubles. Overpriced guns with ridiculously high reserves don't sell... same as in the past. And among the brands of vintage American doubles I follow, the hammer prices are higher than they were 10 to 20 years ago. I'm sure overall price inflation is a factor, but they seem to be holding their own.
As I type this, I'm waiting for the Big Brown Truck to deliver an Antique Syracuse Lefever that was advertised as a 12 gauge. However, it may turn out to be a 10 gauge according to bore, choke, and wall thickness dimensions provided, which would make me happy.
By now, we all should understand that the collapse in British Double prices was almost entirely due to a large increase in supply, and reduced demand over there. British gun owners have been unloading their guns because of things like onerous licensing and storage restrictions and lead ammo bans. They are being driven out of the game by increased costs and regulations. The cause and effect is clearly evident. The same thing could easily happen here in the U.S. if enough gun owners remain willfully blind, and continue to support and vote for anti-gun Democrats.
Unfortunately, that would involve convincing them to remove their heads from their asses.