The copyright length is so long and has been extended so many times that it for a long time could have been considered infinite. Maybe with some new works showing up in the public domain on January first now it's true again. But still, the length is looooong. There are books from the 1980s and 1990s that are out-of-print and almost impossible to find. Some authors are able to take back their copyright and release them to the public domain or some CC license after they are out-of-print but many works are just abandoned.
I'm all for people making a living, but man, it's absurd these days. Maybe we should move copyright down to 20 years or something.