I don't understand the framing of the assumption.

Was the data scientist role only about building NLP models? Are the LLms gonna build Churn prediction models? Tell the PM why stopping the A/B test halfway through is a bad idea? Push back on loony ideas of applying ML to predicting sales from user horoscopes?

Maybe the role is a bit tinier in scope than 10 years ago, but I see it as a good thing. If you looked at DS positions on job search sites the role descriptions would be all over the place, maybe now at least we'll see it consolidate.