The market for SxS shotguns will continue to diminish as time goes by. Just look around and observe how many young guys looks for SxS shotguns at local shops. Where I frequent only older retired guys are interested in them. The demise of this type of gun will be accelerated if there is comprehensive and far reaching non-tox shot mandate.
The only people I see looking at SxSs in local shops are those who are looking for "sleeper" guns - used, often on consignment and very underpriced.
You'll find brisk SxS activity, both browsing and sales, at serious places such as William Larkin Moore, G&H, NECG, Robin Hollow and several other upmarket places.
SxSs can be steel-compatible and many are.
Pumps and autoloaders will always outsell SxSs just as Fords will outsell Jags.