My subjective assessment is that agents like Copilot got better because of better harnesses and fine tuning of models to use those harnesses. But they are not improving in the direction of labor substitution, but rather in the direction of significant, but not earth-shaking, complementarity. That complementarity is stronger for more experienced developers.
Of course, it could also be argued that some day we may decide that it's no longer necessary at all for code to be written for a human mind to understand. It's the optimistic scenario where you simply explain the misbehavior of the software and trust the AI to automatically fix everything, without breaking new stuff in the process. For some reason, I'm not that optimistic.
For as long as a human remains the customer.
Once humans become the proverbial horse supplanted by the automobile... I don't suppose glue really cares.
I can see AI making things more productive but it requires humans to be very expert and do more work. That might mean fewer developers but they are all more skilled. It will take a while for people to level up so to speak. It's hard to predict but I think there could be a rough transition period because people haven't caught on that they can't rely on AI so either they will have to get a new career or ironically study harder.