As much as I'd like to think the controversy had nothing to do with this, I still think it does a little. I don't doubt this decision was reached before the controversy, as most couples last a little more than a year before they're off the show. However, the incidents surrounding T-ara sped up this process pretty quickly.
Sad to see Eunjung taking a huge hit from all this...I think she's had the most activities thrown back at her.