This kind of system was sustained for thousands of years in many different cultures, so I wouldn't exactly call it unsustainable. I would very much call it ugly and undesirable though.

My point here is that there is no guarantee that this will be solved just because it's "unsustainable". I don't understand why people aren't literally protesting on the street; we did so in the 70s and 80s ("geen woning geen kroning") and the situation was a lot less bad back then.