It's lost a huge chunk of it's playing base since it's opened that's for sure.

I'm sure there are players that are already high level that still play but I doubt you will see too many lowbie chars walking around.

It's obvious Tera will go f2p in the future.. once that happens then I'm sure the game will be pretty popular.

PS : I don't play Tera and never have but I have read plenty of comments about it, I would probably play it if it was f2p tho.