COBOL runs on mainframes, which need clean power, air conditioner, filtered air, and on-call support engineers. Those things will disappear first under any sort

COBOL runs on mainframes, which need clean power, air conditioner, filtered air, and on-call support engineers. Those things will disappear first under any sort of collapse. If any sort of collapse hits, the popular programming jobs would be either old PCs (of which there are tons around, and which have tons of replacement parts); or repurposing old cellphones into something else (again, sheer number of things); or something super simple like 6502.