As soon as I heard that, I immediately thought, aha! This is going to change when the mortgage insurance companies start going belly up, which is pretty much inevitable given the sheer volume they're dealing with, and we know no one anticipated that.
Here it is:
http://www.marketwatch.com/news/story/fitch-downgrades-mgic-investment-pmi/story.aspx?guid=%7B1B7BC7EE%2D5199%2D48F7%2DB878%2D670D3EB36546%7D
A few mortgage insurers have been downgraded and are on negative ratings watch.