Extant lawyers are unlikely to be replaced in the immediate future, if only thanks to regulatory barriers.

Doesn't matter. If technology allows lawyers to service more clients in less time and at lower costs, there will be competitive pressure among new law graduates and up-and-coming attorneys to take advantage of this technology to run their own smaller, leaner practices at more affordable prices for a larger number of people. There's no shortage of people who are in need of legal services -- they just really can't afford it so they go without it. [1] We don't need to replace lawyers, just force them to be more efficient.

[1] https://justicegap.lsc.gov/resource/section-4-seeking-and-re...