Unfortunately, as long as Schuerholz and Cox are making the major decisions in this organization, we won't be seeing much change for quite a while. You can already see that this will be apparent for at least the next year or two with them leaning towards keeping Fredi Gonzalez.
If it were me, I would take a very close look at Kim Ng as our next possible GM. She has a ton of experience as she was an assistant in the front offices of the Yankees and Dodgers when they made their championship runs, and she's supposedly heavy into scouting so you can rest assured that she'll invest in that department so that our farm systems are always kept well-stocked.
Realistically, the Braves will most likely stick with John Hart for no more than a year and then promote John Coppolella.