It depends. For context, Scott Drew is in his 19th season at Baylor. They have advanced past the second weekend four times and won the conference one time. But I think the school is pretty happy he is there. Basketball is a fickle sport and you don't just need a good coach, but also a lot of luck and a lot of stars aligning. Malaki Branham having a great season and likely headed to the pros isn't just a credit to him, it's a credit to Holtmann to have a freshman buy in and play so efficiently. But it also hurts next year's team a lot. That's not something you ding a coach for.
I wouldn't feel comfortable moving on until I'm reasonably sure what I have. The timing is weird but if he was a coach like Fran, I'd feel more comfortable moving on, because it feels like Fran's teams have a real cap because they never play great defense. But if they do round into form defensively and they are fielding good teams, you keep the coach. The risk of getting worse, or much worse, is much greater than the chance at getting better.
I'm a little more pessimistic and a little less patient than you.
My coaching decision matrix basically starts with assessing the school's long-term average performance:
- Ohio State has 20 league titles in ~100 years of league BB so that is roughly one every five years.
- Ohio State also has 14 S16's and 10F4's but those are all-time numbers so not really comparable to the current format. Still, I consider a S16 to be somewhat equivalent to a league title so my view is that the program on average is good for any combination of two league titles and/or S16's every five years.
That is the baseline. If the current coach is performing below the baseline it is time to move on. If he is performing near the baseline then he is no better than the average coach for your program so be thinking about moving on but no rush. If he is above the baseline then you want to keep him.
Holtmann is clearly below the baseline but he isn't THAT far off. I think it is time to move on but I'm not in THAT big of a hurry about it.
I also view the risks MUCH differently than you do. My threshold for a memorable BB season is either a league title or a S16 appearance. If we are below that then the difference between being slightly below that and WAY below that is basically negligible to me. If we aren't winning league titles or making S16 appearances then I really don't care whether we are three games out of first (tOSU this year) or 11 games out of first (UNL this year). Either way you didn't win a league title and you didn't make an appearance in the S16.
I'll add this on time since I asked you:
Ohio State's average is a league title roughly every five years. Holtmann is about to complete year five without a league title. He is behind but, to be fair, he is only down by one relative to the average. I think the team is going to regress next year and at that point he'll be down by 1.2 relative to the average. If I were tOSU's AD I would not allow that number to get above 1.5 unless there was clear improvement such that it looked like things were looking up dramatically. Thus, my maximum timeline is as follows:
- 2017/18 - 2021/22 is five years, average is 1 title, Holtmann has zero, he is -1.
- 2017/18 - 2022/23 is six years, average is 1.2 titles, if Holtmann still has zero he'll be at -1.2.
- 2017/18 - 2023/24 is seven years, average is 1.4 titles, if Holtmann still has zero he'll be at -1.4.
- 2017/18 - 2024/25 is eight years, average is 1.6 titles, if Holtmann still has zero I would be 100% in favor of moving on.