Presuming Kentucky will never be this good again is also to assume that the rest of the college basketball elites will not only maintain their ability to remain at a high level once their present coaches retire, but also increase exponentially as programs.
That's more far-fetched than thinking UK could ever match a similar success to what's currently happening. Where are all of these elite coaches going to come from once Matta, Boeheim, Self, Williams, Pitino, K, Izzo, and Cal step down? They'll all be gone within 15 to 20 years.
Kentucky is one of those rare programs that isn't made by a coach. They'll be fine. It's the rest of the nation elites that, outside of UNC and Kansas, have depended on one HOF coach to lead them. That should be worry many of their programs.