i could easily see USB 4 Power Delivery Extend Power Delivery and its successor become a de-facto standard. Many electrical outlets are already coming with usb ports nect to standard AC outlets. once that becomes standard on all new outlets you will see many more devices take advantage of that using USB for power then. after that you will see more demand for even higher voltage in future versions of the USB standard. once it reaches a tipping point it will make since to run DC throughout houses and instead of converting from AC to DC for the USB ports it will be reversed converting to ac for the legacy outlet next to the USB power ports
