Training standards being too low is a perennial topic of discussion around here, along with routine violations of those standards that exist. The discussion most often centers around OW certification, but AOW and specialty courses are popular targets too, and even tech courses are not above criticism.
So, you get one wish. You can create a single new rule that will be universally followed, or you can choose to make everyone follow an existing rule that only certain agencies have or that individual instructors often disregard. You can choose something that will make diving safer, something that will bring in more people, something that will keep the bicycle-kicking morons in the sandy shallows where they won't mess up your dive-- whatever criteria are important to you. But no wishing for more wishes chicanery--pick one thing!
So, you get one wish. You can create a single new rule that will be universally followed, or you can choose to make everyone follow an existing rule that only certain agencies have or that individual instructors often disregard. You can choose something that will make diving safer, something that will bring in more people, something that will keep the bicycle-kicking morons in the sandy shallows where they won't mess up your dive-- whatever criteria are important to you. But no wishing for more wishes chicanery--pick one thing!