I recently ran into this series and damn I'm loving it. To be honest I don't really know much about Joung justice besides the episodes I've already watched so I'm kinda stumped on where the who's gonna die discussion came from. Can someone fill me in?
Yeah, that one was never mentioned in show, but I think I've read in an interview with Greg Weisman, one of the producers of the show, that he said that this show will be darker and more serious, and there's no guarantee that everyone will be alive by the end of the season.
Personally, if it's just about the teens, I'll place my bets on Speedy/Red Arrow. Someone said that Aqualad is the most expendable due to him being the jack of all trades that is outclassed by everyone else, and that it will make more sense and impact in-universe if he's the one dying, but Speedy is even more expendable with Artemis there filling the archery role. Of course, it could be her that's dying, but like someone else said it would do well to reinforce the importance of the team to the group, and his death has great potential in the Kid Flash-Artemis development.
Well, that's if it's the teens. If they're just playing it safe, they can off one of the lesser-known Justice League members, like maybe Zatara if they are going to introduce Zatanna who can do about everything her father does.