The ACC isn't gonna die, it's just gonna change and adapt. Did the B12 die when Texas and OU left? No, they adapted and are fine - and those 2 brands are much bigger than FSU/Clemson and make up a much larger part of their football viewership than these two do for the ACCBecause there won't be any revenue. At the very best you're looking at Georgia Tech, Wake, BC and Syracuse remaining and at that point the conference is dead and they'll have to redo a media deal.
Whatever revenue we get from a new ACC will still be at least 3-4x as much as the current BE deal