People have a tendency to use as much power as they can create. Modern conveniences have gotten more energy efficient over the years, but we negate the gains by buying more TVs, phones, cars, refrigerators, deep freezers, etc. In the future, I can imagine most writing devices having an optional light built into them. Your jacket will have LEDs and charge wirelessly on the rack. Simple things that don't use electricity today will use them tomorrow while we continue to hope fusion becomes a real power source.