And who determines what federal laws are unconstitutional? Not the states, that has been determined in a long string of court cases going back to the earliest days of the Republic.
Roberts has rendered the Constitution moot. If he can grant fictitious powers to the Feds then I as a citizen will look to the state houses for relief. Finding none there then the last "box" will have to be employed.
Well no, obviously not the federal government; otherwise they will construe the Constitution to allow anything.... just as Obamacare shows.
I think there's another way to force the issue, and it involves the next step on the immigration issue: the USSC declared that the state couldn't enforce Federal laws... but they said nothing about prohibiting the State from defending itself from invasion.