Oh I don't think they'd really kill him off. That's what I meant by seemingly. One of those endings where someone makes a sacrifice, everyone thinks it was fatal but they survived and are lost somewhere. De-aging I doubt too. I'm just thinking that the event to save Clark will probably fall to Jon and that he'll make a big gesture to do it. Heck maybe he just gives up his powers or something. I do think the secret ID is 100% going back in the box though, just a question of when, and to me the ending of a storyline as big as Johnson's making it sound will be place to do that.