I might have got round the fragile micro-usb socket design by permanently attaching a tiny micro-usb to usb cable to the receiver and just using a normal usb extension cable to the wall wart. That way you'll never be plugging and unplugging from the micro-usb socket and therefore stressing the socket. I carry my G10 bits and pieces around in a small padded hard case so it's always protected.
BTW, I think Line 6 should keep the micro-usb socket for updating purposes - very handy but also introduce a 9v pedal board socket as well. Looks like there's room on the back for one.