Sure, superblocks worked in Barcelona. But that's one intervention in one wealthy city, and the health gains depend on who gets to live there. The real test isn't whether a fix can scale, it's whether scaled cities reduce asthma, heat deaths, and diabetes across incomes. Health follows housing, wages, and clean air rules, not sensors. If near-future cities privatize those gains, they'll look greener while poorer neighborhoods stay sick. That's why I'm against the optimistic claim. Without universal care and enforced pollution limits, innovation just redistributes risk.