It's not my understanding that the rules will preclude mortgage finance companies from doing renewals. What the rules do is they reprice portfolio insurance. That is how some of the mortgage finance companies fund their mortgages. For finance companies that don't have their own balance sheet from which to fund their mortgages, it's true that these recent measures have a disproportionate impact, but they don't preclude any one lender from being able to do refinancing.
On January 30th, 2017. See this statement in context.