A tax?
Roberts was focused on the individual mandate as a tax, not on the Origination Clause. He decided the mandate was a tax in order to avoid finding that it was an unconstitutional exercise of the Commerce Clause (which was what the bill's authors actually intended).
But the bill actually contains a slew of new, unambiguous taxes, such as the medical device tax. The individual mandate was one among many.
Okay, but the fact is that Roberts will look like a dolt if he ruled the Obamacare tax was constitutional the first time but rules that another aspect of the Obamacare tax makes it unconstitutional the second go round.