I don't believe the demand for high quality audio equipment will go to zero, but like horse racing, another passion of mine, it seems to have less appeal for younger generations. Some of this relates to financial matters obviously, but I think it goes beyond that. Music is more portable than its ever been even though portable music is generally far below high quality. That appeals to the younger folks as it suits their lifestyle and their incredible dependence on cell phones. Not much interest in what we would call critical listening, or in making the investment most of us have made.
My daughters-both in their 30s-love music and I have the iTunes receipts to prove it. They cannot understand, however, my affinity for sitting still for 2--3 hours at a time listening to music. They are perfectly content with Spotify and AirPods
Maybe this will change as technology improves. Eventually, portable music will be delivered at a quality that is unavailable now-might make a difference.