My fiance went to JMU. Huge football fan all around. Even talked my daughter into doing their stupid chant the last time they played the Griz (after a brief separation and a lot of counseling, we are back on track after that travesty and betrayal). She cried when they upset VTech in 2010. She cried when she was attending there and the Griz beat them. When we played them in the playoffs last, she was informing me all about their coach, QB, and best players. She was a diehard. She would see girls wearing JMU gear in Missoula in the summers and scream "GO DUKES" at them. She tried to get out to a game every other year, even after returning to MT.
Their first year in the FBS she was excited, and since then I have watched it just slowly fade. It went from her wanting to watch every game as bad as I did to her then not really needing to watch but still checking in. At this point she doesn't even ask me how JMU did and I couldn't tell you about a single game they have played this year.
Watching that has been a big factor in my opinion on it. The last time we talked about it she just said she doesn't care about a bowl game and feels like they have almost zero chance of ever making the playoffs and zero chance of a title.
I hear your point that you are advocating that we get into the "G6" type of level before the power conferences split away. Personally, from my perspective, I am more worried about us moving up too early and losing fans than us getting temporarily trapped at a level below until we can move up.
And yes, I know that this is one anecdotal piece of evidence. She absolutely longs for the FCS days, and I haven't heard her sorority sisters mention a word about football in a couple of years when we hang out or are on video calls.
My memory is that attendance did drop in the final year of the Stitt era.
The only other point I would make is that we are also in a more precarious position than we may like to admit. It was not that long ago that the program needed to be resurrected. If we had moved up in 2011, I cannot imagine how terrible our teams would have been for the next 7 years.