So this is how the Obamacare ruling is likely to play out. The Court finds that it is unconstitutional in a 5-4 decision. Liberals howl that the decision was partisan, conveniently (or stupidly) forgetting that it takes more than one party to be partisan, and none of the four Democrats on the Court joined the Republicans either.
Next, liberals will complain that it was an activist decision and conservatives are hypocrites for opposing activist decisions unless they favor conservatism. Nevermind that such a decision would be a restraint on government powers and a return to the status quo before Obamacare, not an enlargement or creation of a new law or right that previously did not exist- which is what judicial activism really is.
The first Chief Justice of the Supreme Court John Marshall wrote in Marbury vs. Madison that "it is emphatically the province of the judiciary to say what the law is, not what it should be." Judicial activism occurs when Court decide what the law should be. Overturning Obamacare would not be such a decision.
Arm yourselves with the simple logic to defeat these arguments now, because if Obamacare goes down, they are coming.
I'm also betting that if Roberts doesn't write the opinion himself, Clarence Thomas will.