It's plausible, though not likely, that the committee could leave UNC out even if they beat Clemson. While people have (correctly) stated that last year our fate set a precedent (i.e. that conference champions from a conference with a championship game that only have 1 loss will still get in), Baylor's fate from last year is also informative. Baylor was punished last year because of their soft schedule (at least partially). You want a soft schedule, look no further than UNC which boasts 2 victories over FCS squads. In addition they've bested 1 team that was ranked (Pitt was 23rd) when they played and 0 from the current top 25. If you bust out the FEI strength of schedule, they're schedule is 117th most difficult (according to last week's data).
This isn't to say that they'd be left out even if they beat Clemson, but it may be more nuanced than just a binary decision. Did UNC look awful as Clemson managed to finally Clemson themselves into a loss? We probably have good shot. Did UNC look like we did last year against Wisconsin? Then UNC is playoff bound. Somewhere in between? That's where the rubber meets the road, but we'll still have a chance (not a great one, mind you, but a chance).
In the end I doubt it will matter; while Clemson may be more likely to lose than Alabama (against a Florida team sans offense), that isn't saying much.