As long as there's internal documentation, which virtually every serious shop has, it can be processed and combined with AI. There are startups selling this product already. I've seen first hand some very narrowly focused domain knowledge becoming more accessible when you can ask the chatbot and the thing is right. It works.
Come to think of it, domain knowledge should be an LLMs strong suit as long as you can provide the right documentation, which is working pretty well already.
Right now the main issue I see with AI is that it doesn't do well with scaling. It's great for building demos and examples but you have to fix its code for real production work. But for how long?
Documentation rarely reflects how anything is actually done, referred to by good business analysts as 'shadow functions'.
In ERP software there are MLOCs without any technical documentation. And nobody would spend a dime to create one. So, the deep expert knowledge on how business processes are supposed to work (in full detail) and how they are implemented is mostly in the heads of a couple of people.