Honestly I don't want her to go back, it would be awkward and they would probably abuse her into quitting or make her life miserable, but it would probably benefit her and T-ara's image.
At the very least, this may create a precedent that will make PD's think twice, before doing this.
But I bet no will care that Eunjung actually got threatened and bullied in this whole situation.... So much for anti-bullying justice.