You can't fulfill a basic human right contingent on enough taxes coming in. If it's really a basic human right, insufficient revenues or unexpectedly high prices are not an excuse. If your country ran out of money, if the builders all started working for foreign companies, and if housing was really being treated like a human right, you'd have to make builders work without pay, or at least involuntarily.

Providing housing most of the time is just a program. Providing housing all of the time with no exceptions, like you would expect from a human right, involves some serious distortions of other values. That's the problem, people are using the word human right when they mean high priority. It's a high priority that I do my laundry, but if society were organized so that I did my laundry at all costs, if we were all convinced that a society where I did not do my laundry did not deserve to exist, then things would get pretty crazy.