If upheld, a counter measure I see developing. Like being required to be certified in the field of your expertise or licensed, bonded and insured in the various over the road, equipment use and legal type jobs, an individual seeking employment will be required prior to being employed, to be medically insured in order to fill their respective position. No different than some jobs requiring physicals or testing for substance abuse.
If this court decision is upheld, I predict that a counter-measure will come to exist. In much the same way that holders of jobs relating to trucking, heavy equipment, and the law are required to be certified or licensed, bonded, and insured, job applicants will require health insurance to be hired. This would be no different from the requirements that some jobs have regarding physicals or drug testing.