On the civil side, high-dollar disputes are already litigated. The real potential growth enabled by cheaper legal services will be in small claims. Those courts can be scaled up because they don't require a jury or even a real judge.
If the cost of what a lawyer does today drops to pennies, the system probably needs robo-judges, and/or massive penalties for taking something in front of a human judge when the facts sufficiently completely one sided, as making them pay the winning party's legal fees will become insufficient deterrence.
Maybe courts could be replaced by AI too once it's good enough?
With the right to escalate to human judges of course.
and without turning it into current phone helplines or support chatbots, god please.