We are at a very low level of basic new diver certs. The number is in the low 200k range. The US population is 330 million +.
In the early 80's the US population was in the 250 million range and diving was recording new certs @ about 250k per year.
We can count all the extra courses, rescue, AOW, etc. The essential number is how many folks take a basic cert each year.
We now have fewer new divers and an aging population of previously certified divers.
I've have been diving in the Caymans, Cozumel, HI, the great diving in the Florida Keys and all that. My favorite diving is here, Point Lobos, the Channel Islands, the
North Coast of California. I was fortunate to have been trained properly to dive in local waters.
Lower standards do not increase retention or growth.