There’s no beating around the bush, Obama has staked nearly his entire presidency - or certainly the first half of it - on the legitimacy of his health care reform bill, and if the USSC nullifies the law (which is now a very likely possiblity it seems) it would SEVERELY undermine the rest of his agenda. There are a ton of frightening outcomes of taking out the ACA too.
I mean, (1) it basically would eliminate the possibility that universal health care will ever come to the US (at least in the foreseeable future). (2) It would put us right back where we started from and INVALIDATE the entire two years spent writing and passing the bill in the first place. (3) In the absence of a passed HCRB and in the wake of a negative USSC outcome, Congress will not be able to address this issue again for another GENERATION or two; today’s lawmakers are far too partisan, and I guarantee you that no politician will even touch health care (even Obama if he gets a second term) for the next few decades. (4) Perhaps most importantly, invalidating the ACA will put this country in a situation where essentially the ONLY solution to our HC crisis will be for us to adopt a single-payer system because the private alternative would’ve been deemed unconstitutional. The problem with that last scenario, though, is that there is no movement on the single-payer front, and Congress members today are much too terrified to embrace such an idea anyway; in the meantime, the problem would only get worse, and I highly doubt that they would coalesce around that solution to begin with.