I don’t agree with Roberts on much but he’s right on this one.
from the article linked to below:
“I think it’s hard for you to argue that Congress intended the entire act to fall if the mandate was struck down when the same Congress that lowered the penalty to zero did not even try to repeal the rest of the act,” Roberts told the attorney representing Texas, one of the states fighting the law. “I think, frankly, that they wanted the court to do that, but that’s not our job,” Roberts added.
Roberts is right. Republicans are trying to get the court to repeal the ACA (Obamacare) since they failed in dozens of attempts to do it in Congress. It was passed as a law. If it is going to be repealed, it should be done the same way – by Congress.