Oh well, I suppose cosplaying Cassandra is pointless anyway. We'll all find out in a year or so whether this was the beginning of the end or not.
LLMs are just revealing the weaknesses inherent in unsecured online communications - you have never met me (that we know of) and you have no idea if I'm an LLM, a dog, a human, or an alien.
We're going to have to go back to our roots and build up a web of trust again; all the old shibboleths and methods don't work.