This is why I am all for the current hype and the apps. Everyone that has access to electronic media should now that videos are now more easily to manipulate than ever. This undermines the attack vector of supporting fake news with fake videos. (At least it should, I do not know about the psychological side of it. Maybe even knowledge of a video's falsehood does not diminish its impact that much. Still I think it is best to make video fakeability common knowledge.)
On the flip side, this enables revenge porn deepfakes and person to person harm on a much, much more common level. If you are someone who becomes briefly famous on the internet, expect that a TON of harmful or disturbing videos of "you" will show up in short order. I'm not sure we have good regulations and laws in place to protect people against the misuse of this tech yet.
There's not a single thing in the chain of tools and knowhow required to produce this that can be kept out of the hands of malicious actors.
The best course of action now is to rapidly educate people of the implications and hope that the initial wave of abuse will be without too many casualties.
I think parent was making a point that once this tech is in the hands of the common man, it's value for sophisticated players might diminish strongly. Same way as an undisclosed 0day in a high value target (say IOS), is extremely valuable. Once it gets disclosed and everyone knows about it, people can come up with workarounds and eventual fixes, rendering the threat basically defanged.
I'm leaning towards the same school of thought. I'd rather see this tech widely accessible and hence all video/picture material henceforth considered completely untrustworthy, than living in the misguided notion that video evidence is trustworthy.