Imagine if we did something like that for home loans what would happen? In reality, a student loan amount should not be given more than some percent of 10 year

Imagine if we did something like that for home loans what would happen? In reality, a student loan amount should not be given more than some percent of 10 year salary estimate for that enrolled major. That obviously means some professions like teachers or social workers may have difficulty in affording an education. In those cases they should be supported through grants. Atleast we need some feedback loop to keep education costs under control otherwise schools will keep raising the costs.