I think the wording on the WSJ article is unclear and the more likely scenario is that the iPhone will continue to have a Lightning port but that the power adapter will have a USB-C port, i.e., a USB-C to Lightning cable will replace the USB-A to Lightning cable.
I hope not. The Lightning port is excessively prone to corruption. You can replace a cable when it goes bad, but I've had to replace two nanos because of port corruption.
In the realm of scientific observation, luck is granted only to those who are prepared. - Louis Pasteur