Well, I never said it was simple, and most rights in the bill have the 'progressive realization' piece put on - because the framers of the constitution realized that there are limits to the government's budget (interestingly - education does not have that breathing room *hint* *hint*). But I fail to see how a list that is "hundreds of thousands" long meets any reasonable definition of "progressive realization" - surely that would require a measurable decline in the length of the list year on year ? 
More affordable works for those with some means of "affording" -it certainly cannot, progressively or otherwise, make housing available to a large number of people.  If it could then informal settlements would not exist, somebody would have gotten very rich selling cheap houses to the poor. 
I understand it's complex. I don't have the answer. I voted for policy experts to find the answers. I'm just starting to doubt if the DA is up to the job. Perhaps it's time to change my vote.