Latest rumor is Apple's Air is going to have only one USB 3.1 port for everything. http://9to5mac.com/2015/01/06/macbook-air-12-inch-redesign/
No maglock power supply, no display port, just the one port.
No maglock power supply, no display port, just the one port.
And even if you run out of juice, you can probably recharge it within 30-60 minutes. So it would only mean this long without a usb drive.
Finally, who knows - perhaps Apple will turn the power brick into a usb hub.
One port that can do power, data, or video is pretty spiffy. Using that as an excuse to only have one port on the entire machine seems a bit extreme. At least give us one on each side..