Not necessarily. Tons of audio-connector cables stopped working overnight when Apple pettily disabled them. One end of the cable was Lightning, and the other two ends were USB A and a 1/8" stereo audio plug.
If the rumor is true, I would bet that it's more about bringing MFi to USB-C devices. Which is totally compatible with USB-C.
1. Wringing extra revenue out of every possible angle 2. Preventing developers from doing anything unforeseen; a longtime Apple mania