> Fantasy book are a good example. A Games of Thrones was first released in 1996 but had middling success. It was only after 2011 that the series exploded in popularity. Good Omens main peak was ~15 years after release. Hell, some books like Handmaiden's Tale were published in 1985 but only reached their peak in 2010.

Using your example and the rules suggested in the grandparent post, GRRM's copyright would have been set to initially expire in 2024, where he would be able to pay $100k to renew it until 2038. Handmaiden's Tale works in a similar way, with the initial expiration in 2013.

This still seems very reasonable to me.