1) I believe we need true AGI to replace developers.
2) I don't believe LLMs are currently AGI or that if we just feed them more compute during training that they'll magically become AGI.
3) Even if we did invent AGI soon and replace developers, I wouldn't even really care, because the invention of AGI would be such an insanely impactful, world changing, event that who knows what the world would even look like afterwards. It would be massively changed. Having a development job is the absolute least of my worries in that scenario, it pales in comparison to the transformation the entire world would go through.