I had an elderly relative who couldn't understand why she should pay school taxes when she didn't have any kids in school. I said that we all derive a common benefit from helping to educate other people's children, because one of them may be working on my brakes someday. He could be my doctor or dentist. Today's student may be the technician who maintains my cellular network.
There was a push back in the 30's to provide children with only those skills they'd need as adults, effectively turning the school system into a training ground for industry. Fortunately, it was never implemented because people recognized the folly of turning out students with only a narrow range of skills. Specialization works well for insects but less so for people. I think one of the other effects would lead to the development of a permanent underclass that would be under-educated and easily manipulated.
Kinda has been implemented - not overtly, but covertly.
We have lost most of the arts in public schools - probably because they have been shown to enhance learning and intellect, as well as making a well rounded person who can function much better in a complex society. But since the desired result is the opposite of that, well, we are headed toward - if not already arrived at - the permanent underclass, under-educated, and easily manipulated. As demonstrated so obviously by Oklahoma election results.