With the current Tera population it's almost impossible to get decent que for this battleground (according to PVP trackers last time it qued up was yesterday and only once), not to mention that it's lvl 70 only.
For example if CS was a 20-man battleground it would surely be revived because there are multiple instances where the que sits at 20+/40. Yes it would change a bit how the battleground is played, but I think it's better to play it 20-man that not at all.
Anyway it's probably not feasible on the Gameforge side to lower the amount of members needed to que and this probably won't even be read, but who knows.