That conclusion does not follow. The pictures will become public domain if and when the copyright expires on them. Assuming that happens.
That's why plenty of artists - plenty of nature photographers among them - died relatively penniless.
http://europeansectionlgm.typepad.fr/photography_and_cinemat...
That's a friend of mine who died 3 years ago, he made the most amazing pictures. 50,000 of them in a archive in his home in Suprasl, and we can't even find the funds to properly digitize them so they will likely be lost sooner or later.
That's why plenty of artists [...] died relatively penniless.
can you expand on this? how does lifelong copyright cause artist poverty? i'm not signalling either dis- or agreement, but your claim needs to be substantiated.