Big shoes to fill.
As a fan I obviously want Polisky to be to be an awesome pick who will do nothing to diminish the same unbridled support I gave Phillips for his entire tenure. I have no significant objections, and would like to trust that an investigation around the cheerleading situation CLEARED him (as opposed to turning up "insufficient evidence" to the contrary). On paper I prefer an AD be rooted in student development with more direct experience in college athletics, but with so many other factors to consider like development, legal, marketing, and NCAA/B1G politics...I get it.
As a cynic I can't help but point out the lame duck retiring white man picked the already-part-of-the-establishment white man with some ethical baggage over the internal woman candidate who was good enough to serve as interim AD, and two other fairly well-qualified female minority candidates. Always bet on the white man.
Ultimately, with the Phillips departure and Morty's being imminent, continuity might be the most important factor here as we transition to a new president. If Polisky doesn't fit I doubt the new president will hesitate to make a change.