From a legal/evidence perspective, what is going to happen when it will become impossible to tell the difference between a video generated by AI versus the real thing?
There's only been a short period of human history from the invention of photography to today. We had evidence before photography existed, and we will still have evidence even if photography can be trivially faked.
There's only been a very short period of human history where video cameras were cheap enough to be used for widespread surveillance, but could not be trivially faked. That period is just about over. We had laws prior to video surveillance, and we will still have laws even if video surveillance becomes obsolete.
But it won't. Instead, provenance, or chain-of-custody of evidence, will become even more important.
You can fake security camera footage — but if real security cameras upload their recordings automatically to a service that timestamps them and certifies them, then that metadata (and the trustworthiness of the service) represent a way of verifying that particular footage was created at a particular time, and even by a particular instrument.
Instead of Joe's Corner Store having video cameras that record only to local storage or to Joe's own account on a cloud service, they will instead stream to a service run by a security or insurance company, or (in some places) the police. This service will timestamp the video, record checksums, and thereby provide assurance that a particular video recording is really from Joe's camera and not faked by AI.
Effectively, you can't trust a mere video that appears to show Taylor Swift shoplifting from Joe's Corner Store — but when a representative from Joe's insurance company testifies in court that the video was definitely recorded by their device at a particular time, and has the logs and checksums to prove it, Ms. Swift will be in trouble.
In the court of public opinion… yeah we had better figure out how to quickly prove one from the other or a lot of people are going to have a very rough time
Even if it were technically possible to conclude a video is "genuine" (whatever that means) the genuine public would not trust it. As in... vaccines method of action is too complex to understand, therefore facebook memes are a more reliable source of factual information.
I'm hoping that fake video becomes so prevalent that absolutely everyone is forced to acknowledge that no video can be trusted as a source of factual information.