Those audiophiles who can visit Axpona and similar shows seem both highly dedicated to the hobby and have money and time to burn. That's a hallmark of an older generation.
Plus, music development, production, and consumption is changing - vinyl resurgence notwithstanding. The ease of streaming trumps fidelity for many. And since most younger don't ever have the chance to listen through a high end system, that remains a barrier.
Plus (again), with Sonos and soundbars now delivering such (relatively) decent sound at affordable pricing, I would venture that many don't see the necessity for fidelity - especially as the video/visual component of domestic entertainment is much more engaging than it ever has been.