The real thing people miss is not AI replacing Juniors. Its that senior management soured on hiring juniors even a few years before AI, almost across all industries.

AI is now just the scapegoat for an economy wide problem. Execs found "one neat trick", piling junior work on seniors until they quit. While not hiring replacements in order to goose short term profits. Now every company is in the same position where hiring a senior really means hiring 5 seniors to replace the one that had 5 jobs layered on over a few years. This is of course impossible for any mortal to jump into. Now they also dont even have juniors to train up to senior levels.