The trolling terrifies me.
Trolling someone by creating awful video (just think about how deeply, photo-realistically, awful it could be - porn is just the tip of the iceberg) is going to get really bad. I am not sure how this is going to shake out. The easiest will be video of famous people doing awful things. A little harder is doing a custom training on a particular person's likeness, and videos of that person doing awful things. That high-schooler. That child. It's not a happy idea. There should be severe consequences for deliberately making something like this with the intent to harass (troll).
The fact is we have not even scratched the surface of classifying trolling as a real crime. I am less concerned with the tech (it's inevitable, hand wringing about it is not useful), and more concerned with the fact that we still have essentially no real consequences to this kind of harassment.
I suspect that strong anonymity is incompatible with civilized life, since the few edgelords will always end up ruining it for the many. We have collectively decided that some amount of privacy must be sacrificed to live in a civilized place where you can address grievance (the subpoena must be served to someone). Surveillance is a weapon for tyranny, but I think that we need to flip the script. The relationship between tyranny and surveillance means we need better governments, not more anonymity.
I also suspect we don't need to change anything except enforcement. I think trolls are a lot less anonymous than they think they are, since their opsec is typically nonexistent. It's just that we have no enforcers, and for some reason don't care. If I had a magic wand, I would convert the DEA wholesale over to dealing with online crimes (trolling, CP, trafficking, etc).