Jason Snell, in his More Color column for Macworld:
Maybe the recent removal of the headphone jack has reminded me that this is what Apple does, again and again, and arguments for consistency and conservatism never win over arguments for better features and stronger technologies. If today’s Apple is the same one that ditched the headphone jack last year, I’d expect Lightning to start going by the wayside beginning this fall. But it’s a close thing–I wouldn’t put money on it. Not yet, anyway.
The argument for adopting USB-C on iPad Pro seems seriously compelling to me.
See also: John Gruber's take on the WSJ's report.