I think it's pretty obvious that autoencoder deepfake tech and similar technologies are going to be useful, maybe even essential in visual effects. The perceived problem seems to be that the 'irresponsible rabble' also have access to it.
But as the barrier to entry for really convincing output goes up (768px /1024px training pipelines, and beyond), and it suddenly becomes something that one person alone can't really do well any more, the 'amateur' stuff is going to look far worse to people than it does now. You just have to wait for that barrier to rise, and I can tell you as a VFX insider that that is happening right now.
Deepfakes are the reverse of CGI, which began as an inaccessible technology and gradually became accessible, before the scale of its use in VFX reversed that again.
Now, assuming you can either afford or will pirate the right software, you could probably match any CGI VFX shot in a major blockbuster if you gave up your job and worked on it non-stop for a year of 18-hour days (assuming you'd already been through the steep learning curve of the pipeline). So it's out of reach, really, and so will the best deepfakes be.
This stuff everyone is so scared of will end up gate-kept, if only for logistical reasons (never mind any new laws that would address it) - at least at the quality that's so feared in these comments.