Sitake deserves at least this year to prove he can turn things around with a new staff, but if we have another losing season with the same troubling things we saw last year, I think it'll be obvious that he's not cut out to be the HC.
Holmoe needs to take at least part of the blame if the Sitake hire turns out to be a bad one, like Detmer was. However, he also needs to be given enormous credit for the Bronco hire. If Sitake fails, I think Holmoe deserves one more chance to prove he can get it right again. If he were to make another bad hire after Sitake, then he should be gone.