This is true, but I don't think having a team in the CFP is the be-all, end-all for conferences. I'd much rather have the current round robin system in play EVERY YEAR and maybe forego having a CFP representative, say, one out of three or four years than the other way around. By and large, who makes the CFP is an individual team thing anyway. The ACC is garbage but since Clemson is so dominant they are in every year, and they'd be in every year even if the ACC played a round robin.
By the way, the reason there's a decent chance the Big 12 won't have a representative this year is not so much because of the format, but because Baylor and Oklahoma played nobody in OOC and have won a few close games against very average teams and the teams (Georgia and Utah) ahead of them have better overall resumes. We're gonna end up with a one-loss champ which is about all you can ask for in terms of the CFP.
The public narrative changes every year, but in the end it remains the same. Win games, don't lose more than one, and if you do lose one hope you've scheduled well enough in OOC and played well enough to have a better resume than any other one loss teams out there.