Honestly, if an LLM can replace any person at a company it's probably executives and middle management. Unlike other roles that actually need entry level people to grow into senior positions (like software engineers), most management could be done by anyone with enough sense to type emails and schedule meetings.
Executives don't do anything special, they make decisions that are often vibes based or just have a team of people doing data analytics and basing their decisions on that. Any LLM can do that right now and won't even embezzle or SA interns or make me listen to their life story once a year