Även skrivskribenterna har inget scenario i åtanke, se denna intervju med medförfattare Ehren Kruger:
Q: So you’re shifting gears in this film. You’ve got new human characters. But you never actually mention in the film, maybe in the script I don’t know, what happened to Sam. Was there a line of dialogue that got cut where you addressed that?
A: I don’t think it ever made the script. I think we talked about at one point referring to the “Witwicky Incident,” but it never made it, yes.
Q: Do you have any ideas about what he’s doing right now? Because he seemed really eager to be part of the Autobot experience in the previous film, so I wonder how he feels about all this.
A: Well, the reason we ended up not wanting to talk about that too much was that we liked the idea of venturing into this franchise from the perspective of humans on the outside, like the audience, that have just sort of watched these events unfold through the news and through television, and who didn’t know any of the characters or experience the first three things. So they’re coming into this with entirely fresh eyes, without an awareness of things that went on in the previous three films, and well, we liked the purity of that. So we didn’t want [get hung up] with the characters who had been in the previous three.
Så tills någon bestämmer sig för att göra någon form av inbindningsmedia eller en ny film som adresserar den, tror jag inte att du hittar någon form av fjärr "officiellt" svar, bara fläktspekulation.