The unspoken assumptions that underpinned the web included the idea that it was made by humans and that content generation couldn’t be mechanized.
There are already YouTube ads for services that Humanize AI output.
The best analogy is that we are at the start of the Dark Forest era of the net.
I assume people will adapt, based on the things that don’t change. If you cannot make out authenticity of participants, then you index on correctness of argument. If the output is useful to you, then you got what you needed and can move on. A more transactional and less community oriented web.