Lol, if KKS want to make T-ARA better than SNSD (although for me T-ara is far better than SNSD), he should make it 10 members
Btw, here is my opinion about the who will be replaced / out from T-ara (if the replacement really occur)
I think the original 3 aka BIG 3 won't be replaced. Like the other said it will be probably themselves who will leave the group on their own due to their acting careers and KKS fears that.
Soyeon probably won't be removed, because if Jiyeon is the "face" of T-ara, Soyeon is the "voice" of T-ara.
But who knows, KKS said the concept and everything will totally new, so if he really gonna do it, he will need to remove Soyeon "trademarked" angelic voice from T-ara.
Hwayoung probably won't be removed too , based on this statement "After three years as activities as a singer, pride and laziness is effected", Hwayoung just joined for around 1 years
Lastly Boram & Qri. Since JTW album, their appearance is fading more & more ...
This two is the most possible to be replaced.
That's just my opinion and based from my point of view.
Of course no one hope for any replacement.
However, if that's really happen and Park Soyeon is the one who got removed , then I won't be a fans of the "new" T-ara anymore. I will just hear to their old songs and "follow" wherever Soyeon career go ~