In my opinion, making a move now would be making a move just for the sake of it and 'short-sided'. Consider this view point.
The difference between the right hire and wrong hire is not $50k a year. It's not likely $100k a year. It' probably much more, when you add in properly funding ass't coaches. The right coach that you want to lead this program is going to want money in their pockets AND money in their ass't coaches' pockets. he is also going to need that money to entice the best assistant coaches to join him on this project. I know that this may come as a shock to many, but the soccer world does, in fact, exist beyond the borders of New Jersey. There are TONS of great coaches and assistant coaches who would look at the cost of living in NJ, look at the proposed salaries being offered by RU, shudder, and stay where they are. OR go to another school where $$$ and cost of living make more sense. It's, like, a real thing.
So, right now, if you axe Donigan you're stuck with rolling the dice with XYZ replacement and probably making *another move* within five years because you hired the less expensive replacement for Donigan. That's a decent reason to sit tight, take what you get out of Donigan, and then have the full allotment of funding that the MILLIONS that is coming to RU in 2021 via the Big Ten contract and hire the right guy and the right assistants.