It doesn't have to be usb, maybe ethernet would work? Or something new if needed. Rewiring might be a problem (but it was the same with adding a ground wire).

It doesn't have to be usb, maybe ethernet would work? Or something new if needed. Rewiring might be a problem (but it was the same with adding a ground wire). If we have to we can do the data-over-power between the sockets, and use data lines from sockets to devices. This would ensure devices don't have to adapt to that hack and eventually we'll have a clean solution.