Unless Congress tackles the future of Fannie Mae, Freddie Mac and the government’s role, if any, in housing finance, expect the Federal Housing Finance Agency to continue to resolutely employ an increasingly imperfect and outdated conservatorship model to the GSEs, say industry observers. Several times while appearing last week before the Senate Banking, Housing and Urban Affairs Committee and the House Committee on Oversight and Government Reform, FHFA Acting Director Edward DeMarco pointedly urged lawmakers…