Long term, if no one is given credit for their research, either the creators will start to wall off their content or not create at all. Both options would be sad.
A humane attribution comment from the AI could go a long way - "I think I read something about this <topic X> in the NYTimes <link> on January 3rd, 2021."
It appears that without attribution, long term, nothing moves forward.
AI loses access to the latest findings from humanity. And so does the public.
Not all of them will have the capability to cite a source, and plenty of them won't have it make sense to cite a source.
Eg. Suppose I train a regression that guesses how many words will be in a book.
Which book do I cite when I do an inference? All of them?
Now imagine terabytes worth of datapoints, and thousands of dimensions rather than two.