The question I was answering is if we have copyright at all, why shouldn’t it be infinite in length? The answer is that the incentive copyright provides to creators has diminishing returns, and eventually provides no extra incentive… how long that period actually is is not obvious, but it is likely somewhere way before 95 years. And since society gets a benefit when works enter public domain, society has an incentive to try to set the length of time as short as possible while maintaining the incentive to create.
I am not trying to argue for an exact length of time, just explaining why we don’t want it to be forever.
Someone probably could get industry numbers for how much publishers make on copyright older than 50 years… and with the time discount for 50 years of not having the money to use for other purposes… and see how much each creator gets in the star-search lottery
Meanwhile, if you rolled back the last two big extensions --- CTEA and the Berne-joining Copyright Act of '76 --- and brought us back to 1909, you'd still have 60 year terms. I'd flip the argument around and claim that no copyright opponent on HN would accept 60 years either. So what are we arguing about? Does term have anything real to do with this?