The fundamental problem is that people want this stuff to be fixed, but virtually no one wants to sacrifice an inch to do it. So the only way things can really

The fundamental problem is that people want this stuff to be fixed, but virtually no one wants to sacrifice an inch to do it. So the only way things can really change is if a functionally equivalent or better replacement comes along. The Montreal Protocol worked so well because it told companies/countries to phase out what was already an old refrigerant and instead use a more modern and efficient r134a. If someone invents something functionally identical to PFAS at a lower cost and without all the toxicity, you'll have a global protocal signed in a month with everyone eager greenwash their PR with how they stopped using PFAS. And consumers will be happy because they don't have to sacrifice an inch of quality of life.