It wouldn't abolish usury, but only help. Usury and it's admissibility in society is dependent on the idea that the man in need owes those with means more than was given to begin.

There is a balance, I believe, because it is better for the poor man to gain decent abode for his family and pay a little more for it over time than to save and save and only acquire it once his children are grown, but this can be accomplished without taking advantage of his need and capturing him into perpetual debt.