It won't eliminate lawyers, Ai can't represent you in person. Although I think some lawyers would try to get away with it if they could 
It will change the way Solicitors work, they will need fewer legal assistants and Paralegals, they're the ones doing a lot of the grunt work. But, this is a typical pathway to becoming qualified. So I don't know how this will pan out.
I think a reduction in Barristers to a lesser extent, as these are giving opinions on cases and situations which are very specific and can be highly nuanced.
All that said, the legal system is in disarray and knows it has a problem due to the over use / reliance of Ai. It has been referencing fake case history, which has been presented at court in such a way that it seems real. Often fooling both the submitting party, the opposition and the judge.
Ai is good for simple legal stuff that you could reasonably do yourself. I recently used it to create a deed of amendment, which myself and the other party were happy to use. We were both quoted about £1k for our respective solicitors to do the work.
Not sure about that (Genuinely "not sure").
If you mean that AI can't replace a whole lawyer in court because it's too dumb - sure, I agree.
- For now!
Currently, it's as dumb as it will ever be. It's only going to go better.
Does it have room to make another paradigm shift or it will all be just incremental upgrades from now on? There are well qualified opinions on both sides.
As for the procedural aspect: We already know it can react when prompted. We can also set it up to be tactical and tendentious with what it's saying.
We can also rig it up to feel like it's being proactive.
- Again, these higher order behaviours will suck for a while, as it's still not smart enough to get them to the effect that's needed to adequately serve a side in court - but that's, arguably, achievable by improving on what we have already.
If you mean something like "the law requires that any official legal/medical/etc work is by real, qualified people" - I mean that's an arbitrary constraint.
We could wake up tomorrow and read about a law being passed that turns all that around ("consultations have been made", etc...).
I mean, I can see how people will be stubborn and insist on the formality of having to have "a real person", and the people are kept in that job as a part of some ritual

Like how port cranes have absolutely been solved years ago.
In China, there are no people up on the crane, shifting levers - they don't even build cranes with cabins anymore.
In the US, the union holds them in a chicken-and-egg standoff - "you want robots to replace crane operators, but we're not gonna let you ship those in, plus you can't replace humans fast enough while we block shipping and your morbidly obese electorate runs out of palm oil and votes you out"
Man, I wish software engineers had the same "sainthood" like lawyers and doctors and you couldn't deliver software without our sign off
