Most of the old guys I ride with have stopped buying classic and are really getting into gravel, mtb and all road bikes.
Small sample size, but I see the vintage market contracting in the years ahead.
My kids and their friends don't seem to care about vintage "cool" factors like we might. They see the bike as a tool to fill a need.
When they talk about cool, the discussion routinely heads towards tricked out scooters like a modded Honda Ruckus.
Their friends on the high school mtb team wouldn't look twice at my old racing bikes.
No utility for them.