ugggh stadiums DO last longer than that, at least the physically built part. its the Business that changes, and 20 years is a long time in that sense. I'd say the vast majority of the vertically constructed environment is only meant to last for the OG owner about 5 years. Its a depressing stat to think about from my pov as someone who conceptualizes them, but in the end most are only built to make money. Stadiums are no exception in that sense