How technological innovation can massively reduce the cost of living

While reading the article, another possibility for reducing the cost of housing crossed my mind: Ways to make small living spaces more livable. Most of the cost of housing is land, and living in cheaper places is not that desirable - young people especially prefer to live in cities.

So I'm not sure what exactly is the best way for making small living spaces more livable. Maybe convenient+cheap laundry services to eliminate the bulk of washing machine & dryer?