The ACC has Swofford who has no vision for the future, a UNC-centric outlook (his alma mater), an "holier than thou" attitude (He attempted to crush Clemson football but has conveniently been as light as possible on UNC for violations), poor advice and advisors, and a hoops only outlook.
The Big 12 at least recognizes that big time college sports is a business. They attempt to act that way (under the thumb of UT). They have one large population (Texas) and two kings in football. The ACC has two kings and a few Barons. Also, VATech is overrated. The soft scheduling for all those years leaves a bad taste in everyone's mouth, though it has improved, they cannot shed the reputation. Also, VATech cannot win big games. Rack up wins v. cupcakes and no wins against Big Boys = nothing. Outside of the ACC, nobody really respects VATech. Pitt and Syracuse are more respected because of good scheduling and winning big games in their histories.
Finally, the ACC has sucked the last few years, plain and simple. The Big East has performed much better, especially OOC and in bowl games. At some point, FSU and Clemson (and Miami) must accept that they, too, have been weak and will not be compensated for poor performance.