I'm not sure one can conclude that audiophiles are a dying breed and hi-fi in general is going the way of the dodo based on YouTube metrics of two videos. However, if your premise is based upon the old-school idea of what constitutes an audiophile (the middle-aged or older, predominately white male, sitting in his home listening room furnished with one chair in front of a stack of separate audio components and tower speakers) then yes. Perhaps that audiophile version ought to go the way of the 8-track player.
Young people certainly enjoy listening to music and doing so with their friends in social settings but they're most certainly not listening to music the way most audiophiles listen to music. People in their 20s and early 30s have grown up listening to music on Bluetooth speakers and AirPods. That is the starting point for young audiophiles. Most of them don't sit and listen to an entire album and most don't have the discretionary income either. If anything, we need less hi-fi and more mid-fi. There will always be the high-end market for those who have the means and time to build a singular system to listen to their 1st pressing copy of Steely Dan's Aja but the vast majority of people want a system that is easy to set up, use, and sounds good. That means an all-in-one solution with some wireless speakers perhaps or a SONOS system.
I've found that when talking to younger people interested in the hobby, it begins with talking about the music first. Then find out listening preferences (streaming predominately followed by vinyl). Do they listen strictly with headphones/earbuds or do they have a home stereo setup? Is it a laptop streaming to Bluetooth speakers?
I had a young coworker who was into vinyl and I recommended stepping up his headphones to wired headphones/monitors and a decent desktop headphone amp. From there he's gone on to slowly upgrading his speakers and turntable. But again, in tiny affordable increments.
I don't think we have to lament the loss of the ossified version of the audiophile, instead we should celebrate that people listen to music and do so in whatever way they choose. The hi-fi industry is responding accordingly with streaming-enabled powered speakers that completely skip the need for an audio rack. And perhaps, over time these people will go deeper down the rabbit hole that is hi-fi and become avid hobbists as their leisure time and pocket books allow.