Philip Klein isn't convinced that Romney would have the gall to repeal the ACA as president:
[Romney] has displayed zero political courage during his career. He has held opposite positions on nearly every issue, with one obvious exception. He still hasn't disavowed the health care law he designed, campaigned for, and signed with a smiling Ted Kennedy at his side. And it happens to be the forerunner to Obamacare. There's no reason to believe as cautious and calculating of a figure as Mitt Romney would stake the crucial first months of his presidency getting into a bruising political battle to repeal a law, when he still clings to its underlying policy ideas.
The Dish 