Oh, now you've gone and ruined my day.
It's not all bad, really. Some of those vines are ancient by California standards and it's not going to completely dissappear. I've heard from a few people in the know that certain families are really protective of vines/brands they have nurtured over time. If there is enough of a market, someone will take up the slack.
I'm of the mind that competition is a good thing and it tends to bring out the best in things. It just might be that some label you prefer will just cease to be after a time. Hopefully there will always be another to discover