I agree that it'd be better not to buy synthetics as they stand, but that requires manufacturers to shift their production to natural fibers. I think regulation / remediation sounds like a good way to encourage that shift. Consumers buy what's on offer - if everything in the market was natural fiber, consumers would choose accordingly, otherwise they are likely to choose whatever meets their needs (which maybe low-price, or high-fashion, but without more education and alternatives, won't be cleaner water).