It's more likely the number of jobs at all level of seniority will decrease, but none will disappear.
What I'm interested to see is how the general availability of LLM will impact the "willingness" of people to learn coding. Will people still "value" coding as an activity worth their time?
For me as an already "senior" engineer, using LLMs feel like a superpower, when I think of a solution to a problem, I can test and explore some of my ideas faster by interacting with it.
For a beginner, I feel that having all of this available can be super powerful too, but also truly demotivating. Why bother to learn coding when the LLM can already do better than you? It takes years to become "good" at coding, and motivation is key.
As a low-dan Go player, I remember feeling a bit that way when AlphaGo was released. I'm still playing Go but I've lost the willingness to play competitively, now it's just for fun.