McC isn't leaving for probably seven seasons. That'd make him 70.
I very much prefer hiring within the family because they are invested in the family business. (I mean the larger Hawk family in general). Short list would be, in no particular order, Dean O, Billy Taylor, Jeff Horner and Connor McC. The order could emerge in the next 7 or 8 years.
Don't sneer at Connor. I think he would help recruiting by being a youngish HC. Connor plays his ass off and is already operating as a coach on the floor, and more so than the expression typically means. Connor would probably produce tougher defensive teams than Fran McC, just tougher in general. And he knows basketball.
A few years will add clarity or reveal even more opportunities.