The AI revolution could yet mint many more millionaires, which could give San Francisco a shot in the arm. If, that is, the rich stick around https://www.economist.com/finance-and-economics/2026/04/26/san-francisco-ai-capital-of-the-world-is-an-economic-laggard?taid=69f28d8705fd1e00016053d0&utm_campaign=trueanthem&utm_medium=social&utm_source=voante