Trying to advance the sound quality of a system takes both time and money (basically synonymous for any adult), and there's only so much to go around and, as stated earlier, rapidly increasing amounts of things vying for both time and money. Depending on how one defines "high-end", it's somewhere between difficult and impossible to get most people to even fathom the concepts as important, much less act on them. Of all the people I know, there is only one who doesn't scratch their head if you talk about spending more than a few hundred bucks on any component. If somebody asked me for advice in purchasing a system, I'd be doing well to get them to appreciate what you can get for, say, $2K and, if they bought it, they'd probably think they'd blown their lifetime wad for equipment and, since it would never break, they'd never look to improve it. It would also sound markedly better than anything they'd ever owned before, better than anything they ever hear at a friends house, and there'll be a million other things banging at their door for their money and time.
I don't know how many people have to be "converted" to restore the high-end to "healthy", but I don't see it happening with what appears to currently be defined as high-end.