That's going to be an interesting question.

One use of AI, I think, is going to be uncontroversial: autocomplete suggestions. I've watched a coworker use Supermaven as a Jetbrains plugin (back before it was folded into Cursor) that basically gave him autocomplete on steroids. Instead of autocompleting the function name he was typing, it figured out based on code context which variables he was likely to pass in as parameters. If it was wrong, he kept typing. Once it was right, he hit Tab and saved himself 30 more seconds of typing than he would have saved with traditional autocomplete. Doing that a hundred-plus times over the course of an 8-hour workday adds up pretty quickly. And more importantly, it's obvious to anyone that the code was entirely the creation of his own brain, and the AI autocomplete tool was being used as a typing aid.

When the AI tool is generating entire functions, or entire files, the question of authorship is going to become a lot more unclear.