This addition-by-subtraction might frustrate some hard-line housing advocates, who see any reduction in the city’s low-income housing stock as a threat to New York’s livability and diversity, but Harold Shultz, a senior fellow at the Citizen’s Housing and Planning Commission, thinks the city is making the most of what it has. “I think it’s a very reasonable response to a bad situation,” he said. “On the whole a positive, though the advocates probably won’t see it that way.”