Sorry, I figured since this was the spoiler section you knew what you were in for when clicked the link.
Anyway
It works for a comic to go back and fourth with death. Like Snake Eyes in #7, something about the mind and body and the ability to keep the spirit alive and what not, but I don't think Sommers is down for that kind of thing. I don't see serpentor anywhere in the near future on film. What MAJOR reason would Cobra have for bringing him back from the dead and why would the Joe's. I just really figured they would let him switch up and become a Joe in the second to maybe go back to Cobra in the third. Hell, Shadow is a vital character in the Joe lore for me. Besides Cobra Commander he is the most recognizable character.