If King is upheld, what will Congress do?

Congressional Republicans, who have promised and failed to come up with a legislative alternative to the Affordable Care Act for five years, are now promising that they will have a replacement ready in case the Supreme Court upholds the plaintiffs  this June in King v. Burwell.  Here's Reuters:

Representative Tom Price, Republican chairman of the House Budget Committee, told a conservative forum that the high court's anticipated ruling in the case known as King v. Burwell could cause President Barack Obama's signature domestic policy to unravel quickly.

"We need to be ready, willing and able to move forward," said Price, a leading Obamacare critic who replaced Wisconsin Republican Paul Ryan as House Budget Committee chairman earlier this year.

“We believe we are going to get to that point. I believe the president is actually going to be open to a better way,” he added.

A ruling for the plaintiff in King would leave the body of the law intact, albeit in a vegetative state. The exchanges would still exist, though they would be completely dysfunctional in the states covered by Healthcare.gov. Governors and legislatures in those states would be responsible either for finding a way to continue to subsidize the premiums of tens or hundreds of thousands of state residents who have accessed coverage through Healthcare.gov, or for justifying the denial of subsidies to those residents.

Because the law would still be on the books, there is nothing to force the administration to negotiate a full "replacement" that would entail repeal (as in "repeal and replace"). That leaves the question: Are there possible amendments that would meet Republicans' alleged policy goals without shredding the ACA's coverage grant?  Under pressure of abruptly withdrawing coverage from 8 million Americans, is compromise conceivable?