n0,
I think you mean that when 50% of population goes to college, it is not the same as when 5% went. I totally agree – and that includes both level (most college classes are remedial middle school), but also in the effect on the students: most college professors do not aim to create anti-religious free-thinkers, they’d be happy that students can assimilate that correlation is not causation. Maybe, we should discuss “professional ed” from ivy-league. Maybe, just ask your Rav specific questions: is there a problem taking subway to the city, listening about Newton laws for 4 hours and then taking subway back, and then becoming eligible to have a well-paying job for life?
Which step here leads to gehenom, other than for those who have a eshes chayil who is ready to support him. Although, I do not think it is kosher to obligate the wife for this support in the future, at least according to R Avigdor Miller who says kollel should be forever but ends when the wife says so. And even in this case, why shouldn’t the wife get a reasonable profession?