If Matty A is indeed rejoining Hoiberg in the heartland then I say there is no better opportunity to ask Chris if he really wants to stay.
I'm no Chris Mullin stan, to me growing up the dude was an annoying Indiana Pacer trying to #$%^ with my Knicks. I think if he's willing to stay even after all that and a staff change he could have another year but if everything goes to shit in 19-20 don't be afraid to fire him.
If current rumblings and potential exits turn out to be true, then expect a 9th or 10th place finish next season. Hell! We finished 7th this season in what was supposed to be a solid roster in a down Big East.
In order to finish better than 7th, everyone would need to return and all of our incoming players would have to be eligible. We all know that isn't likely to happen.
Best case scenario: Everyone but Ponds returns, along with the incoming players showing up and being eligible. Matt A. also returns.
Worst case scenario: Ponds and Heron bails. Simon decides to go elsewhere for his 5th and final season. 2/3 of our 2018 class transfers. Manuel isn't eligible. And, Matt A. goes to Nebraska with Hoiberg, and potentially takes someone with him.
Scary as it sounds, but the worst case scenario is on the table.