I think one of the following happens:
Nothing changes. Mensa is too arrogant and stubborn to make any staffing changes, and will just make excuses or throw players under the bus. No potential OC or DC worth their salt is going to want to come here and join a staff on a one year rental that is likely not going to be retained after 2020 anyway. Furthermore, it's not like Mensa would cede control of the offense to any outside input.
CDC tells Mensa to make changes. He shitcans some low level guy(s) like Warehime or Mehringer, hires some generic replacements, and proclaims job well done. Titanic deck chairs are rearranged, but nothing noticeably changes in 2020, and the whole staff is inevitably fired.
CDC tells Mensa that he has to make changes, and Mensa is too arrogant and stubborn to comply. Mensa resigns rather than make any changes, and we begin a coaching search for 2020.
I feel like I've seen this movie play out before.