If you follow the comments from the SCOTUS justices up thread from the oral arguments in November, it looks like the ACA is going to stand, regardless of any further changes. Of course, that's not a guarantee how they will finally rule, so I'm for anything that solidifies that possibility.
Edit. Found this comment from Ossoff: “If the Supreme Court strikes down the Affordable Care Act, it will be up to Congress to decide how to legislate such that preexisting conditions remain covered.”
That's no good. Protections for those with "pre-existing conditions" falls far short of upholding the ACA and letting the court potentially strike it down before taking any action, as Ossoff stated.