Watching the trends, I have come to believe that high end audio is dying simply because of the progression of time. Music has changed, and so has the way people listen to it. Very few people today want or need a space hogging, dedicated audio system in their domicile, be it an apartment, or, in many cases, their parent's basement. As others have noted, many just don't have the discretionary funds to invest in expensive gear. Their device of choice for listening to music can be carried in their pocket, and compact wireless speakers with acceptable sound quality can put hassle free music in any room in their abode. Most don't own any music in physical format. Their library, if they even have one, resides in the 'cloud' or they stream it from providers.
The hobby we love has just become a victim of the changing times. All good things eventually come to an end, but, who knows. Maybe in the future, the 'retro bug' will kick in on a new generation, and our gear will be dusted off, refurbished, and given another go, probably at prices higher than we paid for it!