There was a fascinating article jsut released from the urban land institute about the future of housing in the United States, leaning towards the future - what will sell, what wont and where the needs are.  Conributing factors such as aging boomers, echo boomers buying etc. It points to a growing need for rental houses as well as handicap accessible houses etc.
http://www.urban.org/UploadedPDF/412520-Demographic-Challenges-and-Opportunities-for-US-Housing-Markets.pdf