The biggest problem with the play was arrogance. I don't think anyone doubts UM initially overpaid for Cedars. They seemingly intended to be the sole benefactor of building out a health district around the Civic Center. UM figured it could hold Jackson hostage (while allegedly funneling paying patients). Well, it did ok early on, but was strongly checked with JHS' new administration. When the Annual Operating Agreement between Jackson and UM suddenly changed tone, the dominance play was in jeopardy. UM and Jackson are kinda sorta trying to play nicer now.
The problem is healthcare will continuously change over the next 10 years to rely less and less on such large footprints. They can begin to try to fix that through urgent care centers and the like, but it's too late. The oddly sad part is they had an incredible head start on something like telemedicine in-house and didn't throw sufficient resources behind it. Now, there are multiple billion dollar businesses in the space zooming by them. Bad business vision with poor execution. Kinda like our athletic program over the last 15 years.