I feel like
@Goose has answered this question multiple times in the past. I'm flagging him so he can do it again. Support is required beyond just facilities. Personnel, administrative support, recruiting budgets, academic support, student housing, NIL, etc, etc. BB is generally an afterthought in RG's world.
A new coach with the same support level will probably regress in performance, IMO. A new coach who insists as part of his contract negotiations, that more support is given, might do better. But RG will not hire a coach with the bargaining power to demand that.
Tad, and the 20 win seasons he keeps delivering, pretty much are the best you can get with this level of resource support.
It'd piss a lot of people off if Tad got fired or retired, and then the new coach was given a whole bunch of resources and support that Tad never received, and of course all the idot fans would be "see Tad just reached his ceiling."
Absent an absurdly lucky, catch lightning in a bottle, late season run, CU is currently at our ceiling with the current level of institutional support. It is what it is; but right now, it's pretty much entirely on the AD.