If you can create "value" by creating a market, what happens to that "value" when that market is destroyed?

When trepanation went out of style, it destroyed the market for skull-drills, and destroyed the market for hole-in-skill-drilling service providers. While you can argue that there was value to the consumer in not having a hold drilled in their head, it was still a net loss to any shareholders in companies that provided trepanation products and services.