I would not be surprised if the quality of human writing actually goes up. I have this weird feeling that ChatGPT and similar tools will become almost equivalent to calculators for math? My experience as a writer is that sometimes just throwing down a first draft is the hardest step - I could see these tools really assisting in the writing process. Generate a draft, do some tweaking, ask for suggestions or improvements, repeat.
I don't know how I feel about code generated by these tools. Will there be a similar benefit compared to writing? At some level, we will need some deeper mastery of writing and coding to use these things well. Is there a complexity cliff that these tools will never be able to overcome?
A total lack of trust for general internet search results. So much content is already shallow copies of other content. I don't see how general internet search survives this.