The problem I have with your school of thought is not that you're completely off base but you're ignoring that we had one player who had ever played in the Duke-UNC game and Davis and his staff has put together a team that, barring injuries( including Seth's early one) would be a top 10 team, promises to have a larger base to build on for last year and you don't seem to even think of the possibility that this is the very progress you've been asking for. Is it? Damned if I know but for all the various reason stated, I just don't get the rush. It can happen next year or the year after if he regresses.
As Voltaire said, "Perfect is the enemy of good." I think it's too soon to chase the magic hire.
I mean this kindly, but your post is all "ifs and buts and maybes".
We only have 1 player who had ever played in a dook game because HD only retained one player who had previously played in a dook game. That's on HD and it's not some grand excuse.
Barring injuries, this team has not been a top 10 team outside of the antiquated polls. We have much better ways of assessing team results at this point and Carolina was a fringe top-25 in the best of those models and, IIRC, not above 15th in any of them even before injures (outside of Trimble).
We're certainly losing 2 of our 3 best players next year and there's a good chance we lose all 3. Neither of our freshmen recruits are expected to be immediate program changers and so we're going to have to recruit the best parts of next year's team from the portal. That's a tough ask and an area where we should be doing better if we're going into year 6 of a particular coach.
We've had 5 years of HD and we still struggle with many of the same major issues that we were struggling with in the first half of his first season. While HD has shown growth, it has been too slow and too inconsistent. And each year we plod along seeking to be merely better than "good", the door closes a little more on ever being elite again.
To put poor Voltaire's mind at ease, those of us wanting change aren't seeking perfection, we simply want a coach with the proven ability to consistently field a team that plays hard, smart, & together and the better - but not perfect - results that come with it.