The old answer to growing creative demand was more people, more process and more production. AI changes the economics of making. It does not remove the need for direction.
A modern creative organisation may be smaller at the centre, more elastic at the edge and much better equipped. Senior judgement sets the standard. Specialists gather around the problem. Technology carries the repeatable work.
The useful question is not how many people the team needs. It is what the team needs to be capable of.