The point is to have an immutable source to compare against. If you suspect a video is faked, you can find the verified original video that was used to make the fake and compare against it.
I think this is sort of where we realize that Oscar Wilde was actually the democratic candidate in the 2016 election - falsely attributed quotes have gotten out of hand and even relatively reputable sources have made this mistake... I suspect the same will be true of videos soon, your trust in the accuracy of the information will be solely tied to your trust in the organization - if you don't trust NYT you won't trust videos you see there and declare them "fake news", ditto for Fox and everyone else.
This is leading society to a very dangerous place where the truth is becoming a matter of opinion.