Why would they want to? They would use AI, just as they already use a raft of technology to make the work more cost effective and to continue to compete. We don't still use a quill and parchment you know!
Yes, I know, I've worked in the legal industry. But you are still naive to think technology, including AI, won't be massively disruptive to the legal industry.
What you are suggesting is using technology to support what you already do. It's not revolutionary. You're not reinventing your business model to make the best use of technology.
But soon enough, someone will.
Look at what's what's happened with book stores, for example.
The independents have gone and a massive company (Amazon) with a new business model built around technology - rather than fitting it in to an existing pre-tech model - has cleaned the floor with the competitors.
Sure, some indy book shops survive - but not many. People are reading more books, incidentally.
Speak to people who know about tech, and they predict this will happen across multiple white collar sectors. This isn't a radical view, this is what most predict will happen.
To put it another way - why wouldn't it happen? I expect some of the savings will be the end of physical offices, with basic legal advice delivered online by AI.