The ACC should have seen this problem coming during the season, as some beat writers (e.g., John Brice) did when they pointed out that Miami being out of the ACCCG would hurt ND's CFP chances. This would create a Miami/ND fight and strain the ND/ACC relationship. But apart from that, the tiebreaker rules would hurt Miami and other ACC schools by potentially elevating non-CFP teams to the title game (like Duke). The way to maximize representation in the CFP is to do what the AAC did: make CFP rank the tiebreaker. The ACC could have changed the rules mid-season, right? So it would be Miami vs. UVA, Miami likely wins, and there is no Miami/ND issue.
Instead, they did nothing but campaign against ND, the bizarre tiebreaker applied, and we had a UVA team that was 7-1 in the ACC lose to a 7-5 Duke team in a half-empty stadium, thereby shoehorning a second G5 team into the playoff. This is one of several necessary conditions that worked to screw ND. The ACC desperately wanted Miami in the CFP. Be careful what you wish for, you might get it.