There are quite a few head coaching jobs that have opened.
If he left for a HC job, you could understand it. If he were to bail for an assistants job anywhere else, that would be very damaging. Would be saying that he can't recruit the big fish for St. John's. If that happens, this whole thing could blow up.
Hope that this is just a rumor like the LoVett bailing thing and that Slice stays and lands us some 5 stars in '17 and '18.