They use a similar concept in some planes where all of the servos in the wings plug in all at once (automatically) when each wing is attached to the fuselage. Can't remember where I saw it though.

Building up such an assembly wouldn't really be all that hard. The power and ground would be the same for all servos and a separate lead for each signal wire. This means that for a 4 channel plane you would only need a 6-pin connector. The power and ground pins would need to be able to handle sufficient current though or use multiple pins if needed. I have not addressed battery input here.