From a GT standpoint I contend the ACC is what's holding them back. These top GA players see the SEC as a path to the NFL. They want to play in exciting environments in Knoxville, Gainsville, Baton Rouge, lots of attention. Not as much excitement in playing in Chapel Hill, Pittsburgh, even Miami has terrible attendance.
I don't think academics hold GT back as much as most think, not like it used to since Calculus is no longer required. Tech signed a top-15 class a few years ago including Jahmyr Gibbs and several other 4-star players but their coach was a clown; great recruiter and terrible coach and lost to the Citadel and every other team with a pulse not named UNC. They have a new coach who played at GT and coached under Saban so I expect them to get better.
But fact remains Metro Atlanta is an SEC town and that works in favor of the Vols especially since the dwags are ignoring their homegrown talent.