Ok, so we've got $320k debt for NYU grads. They're at around 6.5k students graduating each year. I don't know what portion have "useless" majors paid entirely by debt. Let's say half. That's probably one of the worst offenders, but let's imagine there are around 10 more schools in a similar situation. Ok, 30k students out of around 4 million students graduating college each year in the US ... that's a tad less than 1%.

More than I thought, and enough to call "many", but perhaps still an acceptable level.