Market stratification and placement within any of the strata is a natural result of open economies. It even applies to food staples. There's nobody to blame here IMO
Between my friends, my brother and I, our kids are exposed to some of the best sound anywhere on the planet on a regular basis. Everything from Vintage, SET/Horns, Cutting edge tubes, solid state, digital, LP play and even half inch tape machines. My youngest sits with me and even takes the sweet spot. My eldest is not shy on comments, has bought a few LPs for herself but mainly likes making her own music and making covers on her laptop, my sweet middle child has a passion for popular dance and her dancing pleasure is in direct proportion to the quality of sound. None of them has ever asked for a system as we would define it for their own personal use. They are happy with earbuds at home and portable bt speakers on the go. So IMO exposure is only a small, small part of it.
The only people bitching about the price of hi-end gear are we the people that demanded and continue to demand improvements at an ever diminishing rate of returns that these improvements are trivial to the casual listener but enormous in value to us. The same people that say "Good on you Andrew Jones!" but don't take a second look at the Polks, Klipshs, Pioneers, Denons, Cambridge Audios etc of this world because it was only Elac that broke into the media segment created by us, for us.
There really is no shortage of good, really affordable equipment. Walk into an Audio shop in Akihabara, Tokyo for proof. Just leave the audio snobbery at the door. Leave the rose tinted glasses at the door too. The old days weren't better. There was junk to wade through to find the gems that became vintage classics. Same today, just like finding good new music, you have to wade through even more junk but they are there to be found like for example Fostex bookshelf speakers.
We older guys (I'm 50) just happen to be from eras where having a sound system as a teen onwards was much cooler than it is now. If the question is how do we make it cool again, I'm not holding my breath. Every generation defines its own cool. We don't get to do it for them. For now, IMO the way to expand the market is to tap those within our generations who can afford the 2, 3 or 4 grand for whole, well thought out systems that will knock lifestyle systems costing as much on their assess. Surely we can do that.