My view is that the point at which LLMs could cause the death of SWE as a profession is also the point at which practically all knowledge professions could be killed. To fully replace SWEs still requires the LLM to have enough external context that it could replace a huge range of jobs, and it'd probably be best to deal with the consequences of that as and when they happen.
Sure. What's the point in worrying about that now? That circumstance is so far removed from current experience I'm not sure there's anything useful we could do to prepare before it happens.