I went back to college for a while after I became disabled, because at the time I thought I was doing well enough to go back to work in the right type of work environment... I took out a 10,000 dollar loan to do that...
That said, I went back to work for a year and a half and ended up in far far worse physical shape and had to quit completely, and back to square 1 disabled and needing more surgeries etc.
I still had the outstanding portion of the loan when I had to get back on disability... however, the Obama administration I believe is who created an ability for the disabled to freely discharge their student loan debt, only needing to send in the disability award letter in order to have it discharged so I did that, since 1,000 a month barely keeps a roof over my head let alone pays off the 10 grand.
To me it was worth the try because if I had been able to work again without additional injury then I wouldn't have needed to depend on the public trust, which for me is a pride issue truly - and I do realise that - but I'd give anything to feel as if I was once again a productive member of society...
So certainly in some situations such as permanent disability you can't pay back the student loans, and may require forgiveness, but that's codified into law already.