I really wish we hadn't had known about all this months ago....
Anyway, I'm most interested in whether or not there's another Pit that Malcom can track down.
Like most comics or shows/movies based on comics, if the writer needs there to be one then there will be one. I assume yesterday was to up the stakes. Now, and at least for a while, people will not be able to be brought back by the pit (in the future if the writers want to bring back a character I am sure they will find a way, be it another pit or some other form of magic) but for now Oliver and his friends cannot just bring back anyone they want whenever they feel like it.