Is it reasonable for two people who are dating to have to keep their shared apartment when they break up? What should happen if a roommate becomes flaky or moves out?

These are all real situations that make me think that pinning "living wage" to a level where you have to have roommates is not a good goal. You're basically asking people to survive by accepting unstable living conditions and potentially taking strangers into their homes, which isn't exactly "having your needs met."