I wouldn't be surprised. TWDU is no stranger to kids or teens shooting major characters. I do feel like it is possible for him to die on this show before it ends, even JDM kinda implied that Negan's time is approaching its end. However his story ends, it's not happening this season. None of the early reviews implied something big happening in any way, and then there's also the rumors that the show will last 4 seasons, and the word on the street is that if it's true, we'll find out about it this year, as they're supposed to be filmed back to back. If that is the case, the show is halfway through, and I don't see the possibility of him dying before the end of S3, as he is still one of the leads.