No telling what the guns keep at home, for enjoyment, versus what they shoot, in public, but, I really don't believe this is anything new.
We double gunners are a traditional lot, we cling to wood and blued steel because they are beautiful, but, neither is a lifetime, or, maintenance free product. Few millienials grasp well the concept of maintenance. Most of their things are disposable. Those two facts weigh heavily against typical doubles.
The good stuff will remain valuable for some time to come, but, even on the "for sale" board, right here, most guns listed show a price reduction, and nothing here is ever absurdly priced, to begin with.
Time will tell, but, occasionally, even the best miss seeing the handwriting on the wall.

Best,
Ted