“We did what we thought was necessary to stabilize the market, but we don’t think the government should continue special efforts forever,” said Michael S. Barr, an assistant secretary at the Treasury Department. “As you bring stability, private participants come back in. We do expect this now that the market has stabilized. I’m not going to say there will be no effect on rates, but we do think you are seeing market signs and market signals that there should be an orderly transition.” A few federal officials and many industry advocates disagree, saying the government is exiting too soon. They offer dire warnings of higher rates and a slowdown in home sales. Fed leaders say they will end a marquee program supporting the mortgage markets in March. Obama’s economic team, led by Treasury Secretary Timothy F. Geithner, has decided not to replace it and has been shutting down its own related initiatives.