I think we can agree that 2-3-4 programs currently in the dumpster are going to be credible teams in 5-7 years, probably not playoff level teams, but maybe one will (Washington did it).
If Kansas managed that, we'd be suitably impressed with Les obv. TCU and Baylor were once considered awful, but they had solid years, some great years, before ebbing.
The right coach, and staff, indeed can make a difference at the most unlikely program, but they may not stay.