Those who want education on subjects taught in high school (whatever their value is) will get it themselves. Those who don't want it won't get it even if you send them to high school.
Between American states rolling back child labor laws, and the current federal administration's promising vision of factory and coal jobs for children and their future generations, there will be enough jobs that don't require useless high school diplomas.
Eliminating income tax and increasing tariffs to gorillion percent is just part of the equation. Rolling back of high school education is critical to truly achieve the dream of the "good old days."