Well of course. None of them are getting Big 10 or SEC invites, and the ACC is a lateral move at the absolute best, and more realistically a step back.
If the Big 10 or SEC are going to add any more schools, those schools are coming from the current ACC (or Notre Dame obvs). I'm not even sure there's incentive for them to do that as they already have total control of the sport and any school will need to make their contracts more valuable. Now, if they cut out some of the dead weight schools and brought in FSU/Clemson/UNC/Miami they could probably do that. But I'm starting to think that just adding any of those ACC schools to the existing group won't make sense financially.
If the ACC loses schools to the Big 10 and SEC, it seems obvious to me that the remaining schools would be much better off to merge with the Big 12 in a 3rd leftovers league that will have enough juice to demand some level of inclusion in the football post-season, as opposed to promoting current G5s and falling undeniably behind the current Big 12.