The heavy role of Fannie Mae, Freddie Mac and Ginnie Mae in the post-crisis mortgage market has brought lower rates and considerable liquidity to the mortgage business, but industry leaders question whether private capital can meet the growing need to finance nonbank servicing portfolios and the eventual pullback of the Federal Reserve. “We wouldn’t have the same price we have now without the government being there; its programs provide a 2 to 3 percent discount,” said Stan Middleman, CEO of Freedom Mortgage Corp., during a panel session at the Mortgage Bankers Association’s secondary market conference this week. “They are the whole enchilada. If you took them out, we’d have nothing.” The government-sponsored enterprises are...