First of all, placing the ACA under the Taxation power instead of the Commerce power places greater limits on how that power can be used and dramatically softens the penalty for non-compliance (you simply pay a tax, you cannot be jailed or otherwise punished for failure to purchase health insurance). Congress cannot compel you to purchase insurance; it can only compel you to pay a non-extreme, non-coercive tax if you wish not to purchase insurance. Second, by laying waste to the Commerce Clause argument and making clear that this sort of thing can only be done through the taxation power, the decision may make it harder to pass these sorts of laws in the first place. You cannot hide in the subterfuge of the Commerce Clause — or, if you try, everyone will say, "No, we know better now, this is and must be a tax." Roberts' decision will press new social welfare initiatives out of the commerce clause and into the tax code — and passing a new tax is much more difficult as a political matter than passing a new regulation.
Five Possible Silver Linings in the Obamacare Decision
Five Possible Silver Linings in the Obamacare Decision