What?
Your own added title refers to repealing Prohibition, which was amendment 18 prohibiting alcohol for public use and then amendment 21 repealing amendment 18.
The actual article (and actual title) refers to getting Congress to repeal a previously passed federal law. The actual title hints at state's rights, but calls for Congress to undo a previous Congress.
If we follow your lede, a Constitutional solution is being called for. Amendment 18 to prohibit, amendment 21 to repeal the prohibition, and now amendment 28 to prevent future federal interference in the subject?
I simply glibly suggested that a way to test the several states' appetite for taking control of drug laws is to let a bloc of states propose a controlling amendment at an upcoming Article V proposing convention, instead of having Congress take their time away from more immediate concerns to propose a solution that parallels Prohibition.
-PJ