Spending 80% of your income on housing is just poor budgeting no matter how you look at it.
If someone decides that accepting a ~5 year position that pays close to minimum wage in one of the highest COL areas in the country is the right choice for them... then what?
Academia is kind of like the video game industry - plenty of young people with a dream who want to get in, get abused and spat out by the system. Because guess what, it gets even harder after your PhD. You’ll be paid barely more, except with even less job stability (you’re now looking for a post doc every 1-2 years, or jumping from adjunct contract to adjunct contract) and more stress and responsibility. And of course by that point the sunk cost fallacy has fully set in, you now think of yourself as an Anthropology Professor and there’s no way you’re going to go back and pick up plumbing or programming.
Ideally grad students would stop pouring in, free labor would dry up at universities, and they’ll have to raise grad student salaries to acceptable wages again. Seems unlikely given how badly people want to do anthropology PhDs, and that there’ll always be people who can afford to take a poorly paid position like that because their partner or parents are paying the bills. Maybe unions are the right call, but seems like a strong uphill battle.