I recall Paul McGowan saying that the universe of real HiFi buyers is about 20-25,000 in the US and shrinking.
Let's face it the younger generations have little regard for quality and even less regard for bespoke HiFi gear. They are in debt up to their gills and have little discretionary income. They are not keen to own homes, or even cars if you believe the consumer analytics. They don't generally long to be rich like my generation did (I'm 63) and they don't care to be married either.
Add to that the quality of the AirPods Max, the Bluetooth boom boxes that sound pretty darn good plus the mid-fi brands being poorly made and you have what we have here today.
I don't know how to remedy this, and I don't know anybody who has proffered a good solution.