I don't think you need a PhD to teach at Community College. When I went there in the late nineties you didn't, but maybe things have changed.
My husband and I are in the boat you are afraid of sailing in. We have around $100K or student debt and he is driving a truck making $40-something K a year.
Right now our saving grace is that we've qualified for income based repayment , which is a new-ish program. May or may not help, but it might be worth looking into.
I read somewhere that INTPs and INFPs can have a tendency to be professional students.
Anyway, FWIW, we've really struggled a lot financially (we have four kids, along with the other stuff -- we married young and were kind of naive about the whole grown-up thing.) It can be a real drain on your psyche and relationship to be flat broke and worried about money all the time.
However, good partners -- compatible ones, can be hard to come by. I think I probably would have discouraged his graduate studies if I had it to do over again, but I don't think I'd really change a whole lot else. We do really love each other and all the struggles have made us a pretty strong team. I know, come hell or high water, I can rely on this man and I think he knows, come hell or high water, I will be there with him.
OTOH, with our kids, we do push them to get good grades so that they can get scholarships. We don't push them crazy hard. We don't really have to. They are all fairly intelligent, so all we have to do is make sure they complete and turn in their homework and they do just fine. But we preach Scholarships/Grants = good. Student loans = evil. We didn't have that kind of guidance, but by golly, our kids are getting it.