I agree with that...but it's not even about whether they are a historical rival. For now and the forseeable future, based on fan support, stadium size, recruiting, etc, that game has to be played. Along with FSU-Miami, FSU-Clemson is an absolute must have for the conference. Not having that game on the schedule would cost the conference money I'm sure. Duke and Syracuse aren't traditional rivals either, but you certainly wouldn't want them not to play in basketball.
We don't need an alignment that REMOVES any current desirable games. We need an alignment that INCREASES the number of those games. The SEC is so loaded, they can leave Alabama-Georgia, LSU-South Carolina on the floor, and even that's not ideal. We need to keep games that matter, and add more of them. We need Clemson-VT, FSU-GT, Syracuse-BC, VT-Louisville, Clemson-Miami, etc to happen more often than every ten years. Let's call a spade a spade, and the ACC doesn't have a whole lot of traditional football schools with big fan bases. We've got to find a way to get those schools to play each other more. FSU, Miami, Clemson, VT are the marquee football schools, out of 14 schools. GT, Syracuse and Pitt are football schools in recess. But that's pretty much it, the conference just doesn't generate enough national games, and isn't likely to unless UNC and UVA totally reverse 100 years of history. We need the football schools playing each other more than they do now, not less.
If you want to take away FSU-Clemson as an annual game, I'm all ears as long as their playing every few years, and FSU-VT and Clemson-VT, etc are happening frequently too. But to just flip it so Clemson and FSU play once every twelve years, just after they played the biggest game in ACC history, that's just silly.