I was with you up until this. The black market isn't going anywhere. That's a fantasy.
At some price point or another, the risk/reward situation becomes unattractive for black market providers. It's just not worth it.
The whole black market scenario becomes unattractive for consumers, as well. Why put up with flakes & fakes when you can pay acceptable prices in a nice retail environment with regular hours, knowledgeable staff, wide selection, honest weight, guaranteed purity & potency right on the label?
Put it on your visa card, sir? Of course. Would you like that gift wrapped?
Comparing that to any black market deal I ever did is comparing apples to aardvarks. Yeh, sure, very small growers will always pass some along to close friends, one way or another, but that realm has also always existed. It's a tiny corner of the whole picture.
Another thing we'll see is branding- consistent brand name products. Think Budweiser & Marlboro or even Glenlivet & Dom Perignon. The black market sure as Hell won't provide that.