My MiL (from ND) is so delusional. She once was at my place while I was watching a Bama game about a half decade ago. Bama was ranked 2 or 3 at the time, and she kept talking about the Bison being #1. Zero awareness of the difference between FBS and FCS, and there was no hope in explaining it to her. She would just refute my claims by showing me the Bison #1 ranking on her phone...outside of my MiL, there's not many Bison fans who think they could ever compete for a CFP. Theres definitely some, but I'd say that percentage of fans is maybe at 3%.
As a Twin Cities transplant living in Fargo, I would be very happy with NDSU moving to FBS. Might even get me interested. I've never been to a game, I've maybe spent a total of 3 hours watching them on TV since moving here 10 years ago, and own no Bison apparel. But having an FBS team in my neighborhood would be great. The fanbase here has grown very bored with the success at the FCS level, and I think a move to FBS would reignite the fanbase. I do think they are a good enough program to live in those lower divisions and make a couple top 25 appearances.