I hope this is true and I hope 20% down payments become mandatory.

Hear hear.. and across the board too.. for all loans. One of the worst things that happened to low-income homebuyers was the Community Revitalization Act 1977 (and subsequent amendments/revisions). Before this act, most houses (median) were priced at about 3x gross income (median). Afterwords the ratio shot up. The result is that people (particularly low-income) pay a greater percentage of their income to cover ‘renting their own house‘ than any other expense. The secondary result is that discretionary income drops as well as the ability to save.