Here’s the fly in the ointment

I would expect that the US Supreme Court would rule against the wishes of the States if State authority would trump Federal authority in a serious matter. That has certainly been the one way trend since the 1860s and there are hundreds of cases the Justices could use for precedent to arrive at a well reasoned decision.

I think we need a genuine Constitutional Crisis to get Congress and POTUS to pause and yield to what I feel is the public will to downsize the Feds. There are not many historical examples of legislative bodies voluntarily ceding power to the locals. None I can think of, actually.

If six State supreme courts ruled that their respective governments had Constitutional authority to defy a Federal mandate regardless of how SCOTUS ruled – that would be a Constitutional Crisis. I think that’s what it would take to get the ball rolling.