If they can't be guaranteed more than two years, barring something catastrophic or an investigation, it means they aren't qualified and should not have this job at any point or that JB is pulling the strings in the background.
Other jobs (for all us normies) cannot be compared to HC of a D1 P5 program that is, at worst, a tier two gig behind the likes of Duke and Kentucky and has a deep history of success.
We are in no shape to be doing a "continuity" hire with that kind of limited runway. We aren't recruiting like Duke (or even UNC). We haven't had the recent success that either has had. And, we aren't on their level in terms of attracting overall HC talent when and if they do a fully open search. Red (or GMac) have to be able to pull away from JB's gravity in a capacity that shows where they want to take the program in this new world order of the portal and likely, at the least, more mixed defenses, and maybe some tweaks on the offensive scheme.
We are a case study of one of one. There is no other reference to see how this has gone. That's the other edge of having JB for this long with this much success (over the full arc of his career) but with the shakiness of the last 7 years or so, culminating in last year.