S&P posted U.S. RMBS Roundtable: Mortgage Origination And Securitization In The Post-Qualified Mortgage/Ability-To-Repay Market. The roundtable discussion offers views on many aspects of the 2015 mortgage market, but I found this passage to be particularly interesting:

Originators agreed loans that fall outside of the safe harbor by virtue of interest-only (IO) features have been and will continue to be attractive non-QM lending products. These loans have been originated post-crisis, and originators expect to continue lending to high-quality borrowers with substantial equity in their properties. There was general consensus that IO loans should not have been automatically excluded from QM treatment.

However, large bank depository lenders have shown a desire to originate and hold larger balance IO loans on their balance sheets rather than including them in securitizations. One participant from a major depository institution indicated that, given the increasing IO concentration on those institutions’ balance sheets, there may be a desire to securitize these loans upon meeting balance sheet thresholds. (1)

After Dodd-Frank, there was a lot of concern that the Qualified Mortgage and Ability-to-Repay rules would shut down the mortgage markets. It seems pretty clear to me that lenders are figuring out how to navigate both the plain-vanilla world of the Qualified Mortgage and the exotic world of the non-Qualified Mortgage, with its interest-only and other non-prime products. Lenders are still figuring out how far afield they can roam from a plain-vanilla product, but that is to be expected during a major transition such as the one from the pre- to the post-Dodd-Frank world.