Board Thread:Young Justice News/@comment-47881-20130128165351/@comment-5624498-20130318164955

Wally's presumed death had nothing to do with the cancellation. First, Brandon Vietti said in a recent interview that, going in, the show creators had planned on a three-season arc. So Wally's disappearance was very likely planned from the start. (And for what it's worth, Greg Weisman always says he has rough ideas for many seasons' worth of a show.)

Second, when the final episode was produced, the show creators still had no official word as to whether or not they would get a third season.

As for what would happen if a third season became reality, there have already been some hints dropped as far as who future heroes would be. We've already seen Garfield Logan go on to become Beast Boy, for example, so Cissie King-Jones (who appeared briefly in Season One) becoming Arrowette would be a logical turn of events. The hints about Darkseid's involvement were spread throughout the first two seasons, so one would expect he'd join what remains of the Light as the main antagonist. And I suspect there would be questions answered as to what really happened to Wally.