The idea of playing 9/10 games in the ACC every year would make me puke. I 'd rather play Cal/Wisconsin/ Purdue/Cincinnati ( heck Marshall/ UNLV/Toledo carries as much gravitas has half of the teams in the ACC) than a year-in and year-out schedule that includes the likes of NC State/ WF/ Pitt / Georgia Tech/Syracuse. Heck Marshall/ UNLV/Toledo carries as much gravitas has half of the teams in the ACC. If we went full ACC we'd probably have to give up USC/Stanford every year which again is much preferable to the likes of the 3/4s of the teams in the ACC.
The ACC may be great for ND in all sports except football where it just flat out sucks!
Moving to the ACC full time would be the death knell of ND football. I think it is moot because I suspect there are major changes coming in the alignment of the Power 5 soon anyway.