A predator drone can't the care of this problem unless you mean specifically Assange himself, which wouldn't unpublished the document nor prevent any others from being published.
Yes it would.
Had Assange been immediately introduced to a hellfire missile after he published the first set of thousands of classified war documents, the second & third releases wouldn't have happened.
It is also doubtful that any others would be dumb enough to risk the same fate, after that sort of "what happens when" example was made out of Assange.