I'm not sure it went anywhere, because this is a pretty accurate description of the PhD system.
Apprenticeships for things like plumbers and electricians pay a decent wage interspersed with education.
On the long term a Ph.D may do better than a Master Electrician, but in the short term it's a way better deal. My friend out of HS who started working for Nissan and then Infinity was making 60k+ before he was 21. He's capped at around that much -- like 60-70k -- but most of our high-school friend circle wasn't making that kind of money until our late 20s (and at least one became a teacher, and still doesn't get that much in terms of pure cash comp).