I'm truly frightened by this. We are still struggling with how to deal with the "post-truth" world, and that's with the assumption that pictures are hard to fake, video even more so, and audio nearly impossible.
Fake news is going to reach a fever pitch when "speeches" of Obama leak saying, "We have to take all the white people's guns". And conversely, when a genuine "grab 'em by the pussy" leaks again, a huge chunk of people willfully will not believe it.
Seems possible that we could come up with technological and journalistic solutions, given enough time, but it's moving too quickly.