It would obviously depend somewhat as to how bad of an injury it is, and if he chooses to come out at all, but I would be surprised if he dropped that far. A lot of NBA teams draft based on future projection anyway. He was one of about 4-5 players being talked about at #1 -- I doubt he goes there now, obviously, but I also think he doesn't drop far out of that top 5.
Tough for the kid though. He was a game-changer for that team.