Population is low, not super low. I can definitely say i've seen worse.
If you didn't like the game a couple years ago it definitely didn't change much, if you're looking to return and are afraid you'll find a dead game you won't, at least on Mystel.
Before reinstalling i've spent some time looking at this forum and reddit, thank god i didn't just listened to what people say and i eventually downloaded it again because even if it's not the same experience as during vm1/vm2 it's still decent.
That said, even if it's probably not GF fault if Tera went this route i wouldn't spent anything other than the first month of TC ( you can farm and buy the next ones from broker )
I see, Im glad it's not that low. But considering what everyone has said, I really wouldn't want to invest time and effort into a game that might eventually shutdown. I hope Im completely wrong and Tera does a 180. But if it doesnt, I really cant make myself play a game that might not see a few more year.