It also sounds pretty useful for anyone involved in a lawsuit to be able to present photographic evidence again. I’m sure GenAI is already a big headache for forensics, and enforcing AI watermarks will clearly not be bulletproof.
Security is never a binary property, however, and can usually be better expressed in terms of how expensive it would be to subvert a given mechanism. "This image is either authentic or would have cost at least $x to fake" is already much more useful than nothing at all even without $x trending to infinity.