Let me first say that I don't think we will have human-level AGI by 2030. If we somehow do, all bets are off.
The high-level work requires a large amount of creativity in developing nuanced strategies for a particular domain. It also involves integrating knowledge and ideas from a lot more than the law. Consider that the vast majority of intelligent humans who attempt to make it to partner don't make it. Top lawyers are highly skilled, and automating them away is not trivial.
Also consider the trust factor. We've done some customer discovery in this space and most people would just not be comfortable working directly with an AI. This is especially true because a good portion of what partners are doing is human contact work with clients, courts, and opposing counsel. There's a lot of leverage which comes from being able to read and manipulate people which AI can't replicate easily.
Note that I'm referring to the 2030 date specifically for this. I don't think lawyers (or, really, any current profession) will exist in 2100.