Like the rest had said, SNSD is unbeatable and untouchable so yeah, no way T-ARA is gonna beat them.
What I think is T-ARA has the potential to beat KARA and WG though. Maybe even 2NE1 but I kinda doubt so. It all boils down to the companies I guess. CCM is a rather screwed up company that has poor management, I smell a After School/AKB48 kind of concept with T-ARA, especially with the 2 new and young members. I hope T-ARA wouldn't go that path though.