Running the washing machine at night when it's cheapest may not be desired, rather running it when no one is home and it's off peak. Turning on alarms, switching off lights, dropping temperature automatically. Allowing individuals in the household to have their own work patterns and temperature presets etc.
The key point is that it has to be effortless. No complex interfaces or setup. Plug, play, forget. And only in the next 12-24 months do enough technologies hit critical mass to make it economically feasible.