[jmduke]

Why still so many students go to english/arts/... major and they know they will make less promising income?

Many -- I'd say even most -- students base their careers on something besides projected income. I think this is a very good thing.

[dantheman]

Unfortunately they're taking on massive amounts of debt that will make their life more difficult. If they could only receive a loan for a percentage of their projected income then they'd be able to decide if it's worth it. And it would put price pressures on the school.