> specialize in something quite niche

Always a gamble.

I would advise instead, get very good at learning, understanding complex systems deeply, adapting, and moving quickly.

We're entering the fasting changing landscape of engineering we've ever seen.

Be someone that can quickly get up to speed and excel regardless of the task.

I agree. Specialists who understand (or even do) cutting edge research will be in demand, because LLM's need existing data to train on for good performance. People who can talk to different stakeholders, and deeply understand the company and its business domain will probably be also needed for requirements gathering and management. But the average programmer who writes CRUD apps or integrations like millions of others, and converts fairly refined requirements to code, they will likely impacted very much.