Unions will continue to be regulated by the US government but would hopefully figure out that without the NLRB pressuring companies to negotiate the workers would have to do it themselves.
Most likely though the courts will say it's up to the states and then each blue state will have a labor relations board like many already do for workers not covered under the NLRA and zero new organizing will happen or be supported in red and purple states as industries are slowly shipped out of areas with union presence and the unions reach their eventual demise.
Unions will continue to be regulated by the US government but would hopefully figure out that without the NLRB pressuring companies to negotiate the workers would have to do it themselves.
Most likely though the courts will say it's up to the states and then each blue state will have a labor relations board like many already do for workers not covered under the NLRA and zero new organizing will happen or be supported in red and purple states as industries are slowly shipped out of areas with union presence and the unions reach their eventual demise.