Kyle often says that he will not coach until he is 65. As you say, he just turned 60, so it is highly likely he will retire BEFORE the end of that 5 year period.
As to your question, I suspect it is more likely that Scalley will be Kyle’s replacement. It will be interesting to see if he considers some of the open coaching positions in the MWC, that will certainly be offered to him, or chooses to stay in place and hope to be promoted without any HC experience.
Scalley is a Utah native, played at the U, is young enough to be in the position for a long time into the future, would love to spend his entire career here, and yet, has the same sort of experience, program mentality and defensive acumen as Whittingham. He is familiar with the local culture, is reportedly a great recruiter, and understands managing Mormon mission bound recruits, as well as having great ties to the Polynesian community. And, I’m certain that Whitt would recommend him.
I’m not saying that the new AD would go in this direction, but he would certainly be highly considered.
A more interesting question would be: will Ludwig retire at the same time or soon after Whittingham. Were that to happen, you would have to think that Scalley would consider Johnson on his staff at the U.