Plans for the future
Usually, superhero movies save the big battle for the grand finale. Maybe Justice League will change that. Maybe, just like The Amazing Spider-Man 2 tried, it will save Deathstroke for the ending. In this way, it would be a nice lead toward a further appearance of the Terminator, in which he’d play a more important role.
So, after Steppenwolf is defeated (I guess there is nobody believing otherwise), the superheroes will return to their own cities. And there they will have to deal with their usual problems. This could be a chance for introducing other characters, as well, villains from each superhero’s rogues gallery.
Will Deathstroke be a villain for The Batman, or for the Cyborg/Teen Titans movie? An ending scene just like this would clear things up. But, since the character is seen in one of Bruce Wayne's planes, I guess we can all be certain that he'll go toe to toe with the Dark Knight afterwards.
It would be just a cameo. However, it would end the movie on a different note than other superhero flicks do.
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