I don't follow this logic at all. You want someone with zero coaching experience rather than someone who has been an NBA assistant/assoc. head coach for 15 years? Why do you think Zo would relate better to today's players?
The logic is pretty simple, Mourning, imo, would represent the Georgetown program better than Ewing. As for coaching experience, it's overrated; especially at a program like GU. You play professionally as long as he did at a high level and you know the game well enough to coach. Jason Kidd retired and stepped into a head coaching job in the NBA practically the same day. Coaching success in college centers around recruiting and Zo should be able to do that quiet well. He can hire experienced assistants to teach him the ropes the first few years.
Now you clearly can't take this approach at a school like Kentucky, but at a school like Georgetown? Sure, why not? Ewing's not a bad choice, I've just never been impressed with him in interviews or in speeches I've seen him give. That's not his forte and that is an important part of a college coaches job; promoting your product.