Strongly disagree with "AI Was Supposed to Help Juniors Shine". It was always understood that it would seriously push down demand for them.
The people selling the AIs probably initially wanted to replace seniors with juniors. Much like how Java was supposed to being us as an age where you didn't need to that good at coding 30 years ago.
AI does not look like it will work like that, because the outputs to programming usually need to be precise. Instead, it looks like it may just be a revolutionary tool that it takes a long time to master, and gives the learner a skill that is entirely transferable to a new job.
Could programmers use it to create a new guild system?