Manufactured homes seem to be making a comeback in the realm of the Euro. This story talks about the German market warming up to new designs for 'off the rack' homes including some by famous architects such as Matteo Thun and Frank Gehry.
I'm waiting for someone to take this to the next level and design and sell prefab communities. Design habitable, workable, playful mini-cities. Each two to three blocks long with Two to three story buildings. Shops on ground one, homes and offices above. Small towns and cities could drop a couple of these into locations they want to improve economic foundations and living density. Connect them via mass transit and you have a pre-defined loop of growth.