Unless there was an eyewitness I doubt anyone would have found him for a long time if he had gone off the cliff. If he survived the fall he probably would have died from exposure. That would have sucked.
SURVIVED THE FALL!? There is no chance of that, if he survived hitting that cement barrier at all. Those K-rails take quite a punch to knock on their sides like that. I hope he is OK, I am sure he thought he was going to die, either way.