I'm not sure I follow. Are you suggesting neutral people's kids are getting turned down, say at ugag, and the parents are going "F it, I'm gonna be a ugag fan anyway"?
No. The researchers were saying that part of the school affinity and fan adoption stems from having close family/friends who you can reasonably imagine going to the school - it’s part of the connection. Once a school becomes so selective that you start to give up on it as practically irrelevant to you or folks you’re closest to, you follow a different school.
VPI is more accessible than UVA, just about anywhere is more accessible than Stanford (and yes Stanford is exemplary at non revenue sports, but few people follow those).
Of course having a fantastic winning team pushes through anything, but the researchers say selectivity is a headwind that imo also applies to some extent for GT.
I don’t think uga has to worry yet - not a complete joke anymore, big bunch of my kid’s friends are at uga, all plenty smart, but none of them got into GT (one is in honors college at uga).