The only three blocs at the WTO who would meaningfully oppose renegotiating TRIPS to lower the copyright floor are the US, EU, and Japan. If all three of them say "let's lower the floor", it's getting lowered. The fact that they cannot unilaterally do this does not mean their hands are tied, especially not when they are the ones tying other people's hands.

> On the other hand, want to make it so that anyone can wholesale copy my photographs and sell them for pennies after a few years? No.

The Berne floor is way longer than "a few years".