When dealing with a fermenting pile of technical debt? I expect very little. LLM's don't have application-wide context yet.
AI is definitely revolutionizing our field, but the same people that said that no-code tools and all of the other hype-of-the-decade technologies would make developers jobless are actually the people AI is making jobless.
Generate an opinion piece about how AI is going to make developers jobless, using AI? Less than a minute. And you don't need to maintain that article, once it's published, it's done.
While there's a tsunami of AI-generated almost-there projects coming that need to be moved to a shippable and sellable state. So I'm more afraid about the kind of work I'm going to get while still getting paid handsomely for my skills, than ever being jobless as the only guy that really understands the whole stack from top to bottom.