My biggest worry is the idea of generating data as training data. We're obviously already unwittingly doing this, but once someone decides to augment low-volume segments of the dataset with generative input, we're going to start getting some really crappy feedback loops.
Do you ever have novel ideas while walking or in the shower? Well, you’re learning from data you generate.
There's some cursory indication that in the long tail, training LLMs on LLM-generated data causes model collapse. Kind of like how if you photocopy a photocopy too many times the document becomes unreadable.
This isn't really surprising though. Neural networks at large are a form of lossy compression. You can't do lossy compression on artifacts recovered from lossy compression too many times. The losses stack.