> There is never going to be a moment where a massive problem created by AI finally arrives and everyone throws their hands up and says “oh no we should have just coded by hand all along!”

This is a shortcoming of this way of thinking, IMHO. It's incredibly unlikely that we will never, ever face a massive problem caused by AI.

The problem won’t be because of AI code, it will be because the people controlling the AI have made incorrect fundamental decisions, which would lead to the same problem even if humans were the ones coding.