The difference is most of the "big brand" schools have jumped to the BIG or SEC from the Big XII/Pac 12. Only really Washington and Oregon have a punchers chance in those conferences to jump in the future. So the other schools don't have much of a leg to stand on. The ACC has not lost theirs yet, so that is why you are hearing all the noise from this conference now.
A part of me hopes that Pitt ends up in a conference with like WVU, OSU, GT, Texas Tech, GT, Iowa State, BYU, Arizona, Arizona St, etc. The "best of the rest" conference because all of those schools don't add the value a FSU, Clemson, UNC, or Miami do, so you won't hear the bitching and moaning on a constant basis, but it's still a decent grouping of schools.
It's not the ACC of today, but I'd still be excited about that conference if it would come to fruition in the future.