MLB's stated goals: Better facilities, less travel within leagues, and better geographical alignment, both in terms of distance between affiliates and their parents, and affiliates within a farm system (less travel for teams' roving instructors jumping from one affiliate to the next).
I'm really curious to see how this works out. It doesn't seem to me that there are enough teams placed in a manner that reduces travel within leagues and aligns team geographically with the parents orgs and other affiliates.
To be sure, logistically, there is a set of relationships (affiliates, leagues, etc) that optimizes the problem. But given how teams and affiliations never achieved that solution on their own, I have doubts that they'll be able to achieve it now.