Yeah it shouldn’t be much more than a decade imo. Being able to sit on a copyright for many many decades is genuinely just rent seeking, and bad for everyone.
I love the idea. The problem is that we never even tried to establish some standard licensing system that encourages rewarding the creator while using their copyright. Most people would rather work around and re-invent a slightly bumpoer wheel.
If this does break the stranglehold that copyright has over creative acts, especially in the US, this feels like a net good.