Yup...best we can realistically play for is the ACC Orange Bowl Slot if/when Clemson wins the league and goes to the CFP-(Peach Bowl) or the NYD Six At Large-(Cotton Bowl)...the likely opponent for Clemson is between Miami, UNC or Virginia Tech in the Coastal Division.
Thing is, I don't really feel that the ACC should get a team in. This Clemson team seems similar to that Florida State team that just skated by until they got to the national semifinal game and got completely blasted. Meanwhile, Washington and Michigan dominate everybody they play. Washington will win their conference, and it won't be close, so they're in. Alabama is a lock, possibly a lock to win it all fairly easily. The winner of the Ohio State and Michigan game will get in, but probably for very different reasons. Ohio State has played a couple of teams that are much better than the teams Michigan scheduled OOC, but Michigan has blasted everybody. Same can't be said for Ohio State.
That leaves one spot for the playoffs. I think that will completely depend on either:
1. If West Virginia goes undefeated
or
2. If Texas A&M keeps the Alabama game close
If A&M keeps the Alabama game close, then I certainly think that you could make the case for them getting the #4 spot, especially if they have the same number of losses as Clemson (and possibly Louisville, unless they drop another game, then it goes from a 5% chance for Louisville to go to a 0% chance), as they will have almost certainly played better competition than either Clemson or Louisville (SEC West is the best division in football, 2 legit top 8 teams, to go with two other top 20 teams in Ole Miss and Arkansas, and Texas A&M holds a better win over an opponent that Clemson faced earlier this year in Auburn).
I think if West Virginia goes undefeated, they get the 4th spot. If Texas A&M keeps the Alabama game close, and wins the rest of the games the rest of the way, they get it. If West Virginia drops one, I don't see them getting it. If Texas A&M loses badly, or loses 2 games, they're out, and Clemson gets in.
Clemson could turn it around and start blowing everybody up that they face, but if they keep skating by, then they'll likely lose their spot. The committee seen this once before, from the same division in the same conference to boot, and based on that, I'm not sure the committee would give them a spot just because "they're undefeated".
The reason I give Texas A&M so much wiggle room with this scenario though is because they're such a complete team in all facets.