I think the problem with using money lending as a tool for social justice and equality was laid bare during the crisis. The downsides - lack of mobility for workers, pushing the risk from wealthy people (investors) to poorer people and the fact to function the system needs loans to be paid back at some percentage approaching 100 - all conspire to make this a really poor tool for change.
I think that something like the Australian approach - with enforced retirement savings set at 9% of income (where you earn $50K, and your employer pays $4.5K into super) - is a saner approach to wealth creation for the poorer groups than lumbering them with mortgages.