Concerning BYU, not this year. But I would be worried after NEXT season and Anae, Doman, and maybe Jaime (if the secondary doesn't have another Tulsa game.) This year I expect zero changes, unless another team's coaching change has a buddy calling on a buddy ala Grimes.
CSU: Lubick will retire
Utah: Ludwig will go
Possible hires and fires could happen in the coordinator ranks all over the conference. TCU is one of the first I think of when looking at an offensive coordinator. I am trying to pull up TCU's media guide PDF to learn if their O coordinator is a recent hire or not..but in my opinion. They need some change there.