If Apple did say "we're going with USB C only", power, connectivity, audio etc... and they started making MacBooks with multiple USB C ports, would one need to be assigned as the power connector or could you connect the power supply to any of the available ports? What would happen if you accidentally plugged two power supplies into the same Mac? Can a USB C cable always carry power regardless of what else it's doing, i.e. could the new Cinema display have a single USB C connector that handles audio, video and power for the MacBook?