Mortgage originations are already off to a better start in 2015, and industry economists are predicting, on average, a 15 percent increase from last year’s sluggish output. But uncertain prospects in the housing market point toward a decline in mortgage originations next year, according to forecasters at the secondary market conference sponsored this week by the Mortgage Bankers Association. 2015 should bring the strongest housing sales volume since 2007, said Leonard Kiefer, deputy chief economist at Freddie Mac. Sales activity was decent over the winter, despite severe weather in many areas, but the market has yet to get back to normal. Freddie looks...[Includes one data table]