Obamacare lives on in a kind of limbo. On the left, there is a growing conviction that single-payer health care is the only way forward and that Obamacare is a well-intentioned half-measure on the road to Berniecare. On the right, Obamacare is as loathed as ever, despite congressional Republicans’ failure to unite around a replacement. Yet because Obamacare remains the law of the land, skeptics in the Trump administration find themselves charged with filling in its many regulatory blanks. Will they wind up putting insurance markets on a more stable footing, or will they contribute to cratering them? We’re about to find out.