The thing here is the exponentially increasing cost of renewing the copyright, with the inflation-adjustment I proposed and the 10-year term for a corporate or posthumous copyright, in 90 years, that $1000 renewal fee goes to $256000 in inflation-adjusted dollars. 110 years it’s a million dollars, 210 years it’s a billion dollars. If a work is worth spending that kind of money on renewing the copyright, why not let them keep it?