I agree that LLMs are transformative and it would be silly to have a confident opinion about how they will influence the SE career path. However, here are some less fatalistic takes:
(1) In my software career, there has been nonstop innovation in developer efficiency: version control, languages, frameworks, debuggers, IDEs... There has also been an explosion in the number of people entering the profession. However, the supply/demand balance never inverted. This is because new software produces its own demand! As we wrap the world in digital layers, there is both more maintenance and more opportunity for new interfaces.
Perhaps there is a future where the world has been saturated with software that can be adjusted by a small pyramid of developers. But I expect it will remain central to the most competitive enterprises of the world, and competition is another driver of unlimited demand.
(2) If you feel commoditized by this activity, perhaps you are viewing - or allowing others to view - your job too narrowly. I've seen a tendency in some dev subcultures to narrow the job in search of productivity and objective measurement. Symptoms include avoiding participation in product and design conversations, user research and business-facong activities that give context to coding tasks.
As your career advances, what makes you unique (or not!) is the context you can bring to engineering provlems. If you define your role as translating others' context into code, then you are indeed sitting in the same niche as our LLM. Bottom line, engage with adjacent roles to keep a meaningful structural position.
(3) Regardless of the above, there is obviously an existential mandate to learn to use LLMs effectively and safely in engineering. Your career stage is perfect for leading that charge, in fact we are all counting on you. If you can innovate in how to bring these tools into practice, you will not only stay competitive, you may be surprised at the impact you have and the credibility you receive.