Honestly, this would be a welcome change. The iPad doesn't exactly have the marketshare of the iPhone, so it would be a logical place to start to test out how USB-C would work with iOS devices. Of course, if they decide to go all in on USB-C, we'll have a repeat of the 30 pin to Lightning days where people complain about their stuff no longer working. 1 cord for everything is nice though, it's a bit annoying looking at which end of a USB-C/Lightning cable is the proper end as it is. Apple hasn't exactly been doing much with Lightning these days anyways, iirc, the iPhone still only supports USB 2.0 speeds (at least on the X/8) while the iPad Pro's have 16 pins in the lightning port to utilize USB 3.0. Not sure if this will remain to be the case with the Xs though.
I mean, they already use one port for the MBP anyways, sooo...