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Redfin CEO Glenn Kelman warns that millennials could become the 'roommate generation' due to high housing costs. His comments come as consumer home buying sentiment continues to lag going into the new year. Millennial homebuyers may find reprieve in the Midwest or quickly-deflating markets like Boise or Salt Lake City.Millennials could become the so-called "roommate generation" as would-be homebuyers continue renting or living with parents to avoid paying exorbitant housing...