But I've asked clients this question and while they would love to not have to pay lawyers - if you ever put the thought in front of them and asked whether they actually want an AI to represent them in court, when stakes are high and there's a chance of losing... well, I've never met anyone who has said they willingly take that chance.
Some fields will also certainly never be AI-ified. Not a snowball's chance in hell (and I know it sounds like a cranky person talking) that lawyers and judges in criminal/constitutional trials will ever be "replaced" by AI. It has nothing to to with the possibilities of present and future technology, but everything to do with optics. Society is almost certainly never going to accept being judged and/or losing to AI and algorithms. Even if a person has a losing case they would want to make sure to hear it from a human rather than a machine.