I think one of the reasons, perhaps in the 11th hour, that Chief Justice Roberts voted in favor of the personal mandate was that if the courts HAD ruled that mandates were unconstitutional what would have stopped people like the Koch brothers from going after Social Security, Medicare, Workman's Comp/State Disability. and perhaps even the need for corporations to carry liability insurance.
But then I do recall that one thing Roberts has always supported was the principle that governments have the legitimate power to levy taxes and so perhaps that's why he worded this opinion in the way he did since he knew there was 'case law' supporting the idea that governments have the right to levy and collect taxes and so it would shield him and the courting from being accused of 'legislating from the bench', not that will limit the wackos from going there anyway 
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