I think it is possible that AI will replace live speakers as pronunciation instructors. Or, I should say, I think the technology that makes that option almost obsolete will exist: Humans will be able to communicate with each other using translation devices, that makes learning another language unnecessary.
However, if someone did want to learn a language, what would be the argument for human instructor vs. AI? Humans are more reliable? Yes, for now. AI robots are impressive but they don't sound or look human. Yes, for now.
But if AI robots that look, sound, and behave like humans exist, there is no reason why they couldn't actually be better than humans at teaching pronunciation.