The issue with wine is quality control is dependent many factors, weather, fertilizer management, water management, disease pressure, pest pressure, harvest conditions, unpredictable fermentations and the skill of the winemaker. The more variable the conditions the more unpredictable the finished wine product is.
A good bottle is really tough to make. A mediocre bottle is difficult to make. A poor bottle is what is usually made. I’ve never had an excellent bottle of wine and I think it is a myth. Pricing is mostly unrelated to the quality of the product as well.
When you usually put out a poor product people tend to avoid it unless there is a cultural expectation of low performance. What’s changing is the cultural acceptance of drinking horrible tasting stuff.
The wine industry in needs to adapt and put out a better product or else they will go under.