We've had several recent discussions that touch on these issues. I don't know the resolution, in terms of enforcement here. Eventually, I think it may lead to a total restructuring of the aquarium hobby. There are already moves to ban it entirely. If that happens, then we are responsible to a degree.
We can't seem to get it though our heads that animals aren't commodities, while we have a distribution system that is built on them being "units". On this continent, we're less than 200 years past selling people - pretty recent in historical terms. There's a conflict between our diets (as animals too), our economy, religious writings, traditional attitudes and data on sentience.
Around here, puppy pounds are largely closed, and people can still get dogs through responsible breeders. You can't get shelter dogs or rescues without looking hard, and there are sketchy outfits that ship them in from Texas, for people who want rescues. I haven't seen dogs for sale in a pet store for ages. Closing the puppy mills has reduced the casual, dump the doggo culture to almost nothing, and the few rescues out there are usually because of human's health, age or death. But the supply over all still matches the motivated demand. The casual demand is ignored. Is something like that the future of the aquarium hobby?
I can see where the US model of mega pet corporations could do what Walmart did, and just stop selling fish because it was a hassle compared to the profits. We have chains here emulating the American model, and the amount of floor space given to fish is getting tinier and tinier. That would be catastrophic for our pastime, as we've become pretty bad at keeping clubs alive, and running alternative, ethical cottage breeding set ups.
What do we do? I guess, keep educating. Try to come to a consensus among ourselves about what humane treatment is. Stay on forums and share knowledge about best practices. And try to look at our own fish as sentient beings who like us, only get one life. We're in a situation where we can make it a good one, if we so choose. Choose we should.