This is very measurable, as you are not measuring against others, but yourself. The baseline is you, so it is very easy to determine if you become more productive or not. What you are saying is, you do not believe "you" can leverage AI to be more efficient than you currently are, which may well be true due to your domain and expertise.
Business is business, and if you can demonstrate that you are needed they will keep you, for the most part, but business also has politics.
> probably monitoring how much we use the "AI" and that could become a metric for job performance
I will bet on this and take it one step further. They (employer) are going to want to start tracking LLM conversations. If everybody is using AI, they (employer) will need differentiators to justify pay raises, promotions and so forth.
> they (employer) will need differentiators to justify pay raises, promotions and so forth.
That is exactly what I meant.