You would hope so, but yet… a lot of people are getting their teams to reap cost savings.

Making sure that no employee is irreplaceable doesn't really have much to do with cost savings.

It's just about how you assign work, rotate what people work on, code reviews are a part of it, etc.

None of this has anything to do with AI. If anything, the way that best practices around AI involve lots of design documents, tests, markdown, etc. can actually make it much easier for a new employee to continue where a previous employee left off.