I reject the premise of debt or crack-the-IRA (either now or later) being the only 2 viable options.
1) Maintain a job & complete the grad degree during nights/weekends, using income to cover grad school costs.
1a) Leverage the education benefits that MANY jobs offer their employees to cover grad school costs.
2) Stay in his job, live like a broke college student (which he soon will be anyway), then save up the money for grad school over the course of a couple years.
2a) If he hates his job & that's why he wants to quit & go back to school, (A) poor reason to make poor choices; (B) Get a new job, then do the same -- save up the money before going to school.
3) Although less common for grad school, scholarships, grants, and sponsorships exist that could provide for a healthy chunk of grad school costs.
4) Many universities have programs in place to get hired on as an employee in some form, then they cover/subsidize your tuition/etc.
5) Has he evaluated his (NUMEROUS) options for what school he's going to attend? This selection can make grad school either easily affordable or outrageously expensive.
6) Only you can answer this, but family assistance? Can you, grandparents, or a rich uncle chip in to help fund his grad school costs?
.......Just a few options off the cuff. Layer a variety of the above in combination, and the problem gets even easier. My bottom line: If all of your options suck, get yourself some new/better options.