It is better to have a plan for the possibility then to get caught off guard. More bans come all the time (NYC was just last year) and for rays all we need is some senator who watched crocodile hunter say.. Oh stingrays they kill....Seriously. Are people really arguing about the possible details of a hypothetical law?
In my experience, policymakers create laws in reaction to failures in the market (or in the case fish and animals, hobbyists).
The more that we hobbyists police ourselves and demonstrate that we're responsible, law-abiding and otherwise positive for society, the less that policymakers will feel obligated to make laws that will, inevitably, be imperfect.
Matt