They won't be able to, but they won't need to either - they can just continue cribbing off the original person, or if they are unable to continue cribbing off the same person, they'll find someone else to crib off.
The point is, for all these people outsourcing their thinking, they will always have someone to crib off.
I think (and hope) this won't be as big a problem in the arts because "authenticity" matters to most people, but I for the software industry it feels very disruptive (assuming the models continue to improve and are accessible).