You use Idaho as a cautionary example to highlight the potential pitfalls a move up, but there are FAR more examples of schools seeing a large enrollment boost/anthletic success after a move up. That is hoghleted in this study from Michael L. Anderson (2017, “The Economic Impact of College Athletics”)
https://jvlone.com/sportsdocs/Socie...essNBER2012-w18196.pdf?utm_source=chatgpt.com
In this study it shows that schools moving from FCS to FBS saw, on average, a 6–12% increase in applications within 2–3 years post-transition. Enrollment rose 3–5% during the same period. The bump in enrollment did taper off after about five years, however, unless athletic success sustained the increased visibility garner from the move up and subsequent exposure.
So again, there is far more evidence of schools succeeding and improving at the next level, e.g. Georgia southern, app state, Kennesaw state, texas state etc….. than those who have failed.