We honestly saw the same thing with the STEM rush before the Tech rush.
Only 25% of those with STEM degrees were actually working in STEM because all the seniors fell in place and these companies knew they didn't need to hire Jr. Engineers because they had knowledgeable Sr. engineers.
Unfortunately, as those Seniors are starting to retire that decision is starting to hurt these industries because they could have a lot more Mid and Seniors to hand off to. Now we're seeing Boeing in quite a bad spot for example.
This is the result of Finance bros all up in STEM matters. It won't scale well long term, but that's for the next CEO to deal with.
The thing is Millenials is the new Baby Boomer population when it comes to# of people working, and most of them have enough experience now where companies can see the few who drink the kool aid to rise to be the new oversears as boomer retire and then trim as much fat as possible with Gen AI, Robotics Automation Cells, overseas labor.
Pretty much resulting in companies just having a task force of "leads" who can run reports, ensure automation cells are running as needed.
The thing is at this stage I don't see a "new" hustle coming up to replace the last like you saw in prior gens as the "hot career" shifted from one to the next after the prior dies out.