Thunderbolt 1 and 2 (copper) carry 10 watts. Optical carries nothing. Thunderbolt 3, the one Intel is currently working on and which will have a different port, will carry 100 watts. So yeah, we have to change ports AGAIN, but it will truly be the last time. Five Thunderbolt ports down the side of a MacBook (and eventually three on the 15” iPad) and boom, that’s all you need.