I've said it elsewhere, but I'll say it again. After this year, KO has 2 years to show he's making a significant turnaround.
Next year might be tough, after losing Miller, Gibbs, Calhoun, Nolan, and probably Purvis. One could argue there will be some addition by subtraction there, but especially in the case of Miller, these guys will leave significant gaps that will have to be filled by younger (e.g. Gilbert) or much less talented (e.g. Facey) players. I don't think it's fair to dump Ollie if next year's team goes through some growing pains.
But the year after that? With the recruiting-restricted Brimah class behind us, led by junior Adams, possibly with a senior Hamilton, junior Enoch, and this year's highly-regarded recruiting class as sophomores, that team had better be in a position to dominate the AAC and earn serious national championship consideration. If not, it will speak to a major failure in player and team development.
I would say a top 4 seed and/or a Sweet 16 at a minimum in 2018, after some evidence of growth among this year's returning players in 2017, is necessary for Ollie to deserve his job beyond April 2018.