Earlier quoted context omitted.
PS/2 keyboards weren't on the way out. Apple led the way and pushed USB for a few years before it caught on.
But the lightening port is a closed standard, as opposed to USB. It would have made much more sense here if Apple had used USB-C instead of lightening.
http://www.theverge.com/2016/4/27/11516410/intel-usb-c-audio...
Apple really can't change ports again. I think they're really going to push for wireless. When they get wireless charging they'll remove the lightening port.