There is a gut after production was ramped up during the COVID-19 pandemic. Everyone saw the trend line jump and assumed it wasn't a century-level event but a new trend that would last forever. Vines take a few years to start producing, if you swap or plant new acres you don't see the grapes for ~5 years. Which is now!
The US wine industry has tried for years to get younger drinkers. There is a strong relationship: the younger someone starts, the more time their palate has to develop, and the more likely they are to regularly buy more expensive wines.
The issue is they suck at it and regularly shoot themselves in the foot. I've seen party buses with kegs at tastings, which get people there but barely connect them to wine. Wineries are far, expensive (oh my god, tasting fees. They used to be excited you drove to them. They'd pour you anything. Now it's 2-3 bottles worth of $$ to walk in the door), and have special "rules" and social cues. The barrier to entry is high, and the old people who currently spend the money like it that way. So the audience is aging out.
There are 400-600 individual wineries in Sonoma and Napa. Each. Paso isn't far behind. It's just too many. How do you even choose the 2-6 you go to on a day trip to try them out? Let alone remember them in stores. There won't be consolidation like in other industries, because the brands of all the small fish are so diluted it's not worth acquiring.
There is a saying that "the best way to turn a large fortune into a small fortune is to buy a winery." And holy hell, did a ton of people do that. These small wineries don't make a profit, its a hobby for dozens to hundreds of people. They want the status, even if it costs them. So the market doesn't have clear signals for production and how to self-limit.
The fourth reason is that wineries don't grow grapes anymore. The industry is split into growers and vintners. Growers can take care of large agg with scale. Makers can choose à la carte what grapes they want that year. It's not a bad system and has enabled most of the smaller-scale wineries to launch without going totally bankrupt.
But now there are bag holders, and no one to buy their wares. If growers go out of business, there are no grapes to buy. Since Trump came in, they have already had issues getting labor. Costs have gone up, and no practical automation is available.
I believe there are separate issues with youth drinking, mostly around the risk involved in being inebriated and having a conversation or action come back to haunt you. Kids today live in a panopticon like my age never did. I can't say that I would be willing to open up the same way in today's environment.