I feel like the ingest system will be sophisticated enough to throw away pieces of text that begin with a message like "ChatGPT says". Probably even stuff that follows the "paragraph with assumptions and clarifications followed by a list followed by a brief conclusion" structure - everything old has been ingested already, and most of the new stuff containing this is probably AI generated.

Thanks to a few centuries of upper nobility, we already know that marrying your cousin for several generations is not always a good idea. It'll be interesting to see what happens after a few iterations of AIs being trained on data mostly produced by other AIs (or variations of themselves). I suppose it largely depends on how well the training data can be curated.