Unless something I was told before our season was even over was completely incorrect, there was no possibility of Schertz returning to ISU. If things didn't work out for him at SLU he was going to take a new job somewhere. He already had back plan in FAU because he knew it was going to be open if nothing worked out anywhere else.
I doubt ISU could have found a way to fix all of the issues Schertz saw with being able to keep the program at ISU sustainable beyond this season. It isn't just getting enough money to keep Schertz, it is not being able to have the funds and other things the players want to keep the team he built together.