The huge issue is that stingrays pose a threat to the swimmers if they were released in the waters and they can survive in California during summer with no problems...tho if the tilapia and other tropicals are capable to surviving in California then the stingrays can. California is worst state that have strict laws for fishkeeping around in United States so I doubt they will change the laws.
Ya worst thing that can happen is it turns into florida which is probably what they are trying to avoid with such strict laws