Highly unlikely that the Lightning port would disappear and not at least be replaced by a USB-C port. As another commenter noted, for CarPlay you often need to use a cable (ditto for Android Auto on Android phones). There are a lot of other usage models that also still benefit from having a physical interface port. Also, using the phone during wireless charging is not easy.
It is true that there could be accessories that have a wireless charging coil and a USB-C plug. In fact the opposite accessory, a case with a Lightning plug and charging coil is available for older iPhones that lack wireless charging. But that would not solve the CarPlay issue.
The iPhone 13 is likely to have significant, highly desirable, new features, including an under-screen fingerprint reader, 120 Hz display, much better cameras, reverse wireless charging, vapor chamber cooling, and a much smaller notch, all of which have already been deployed on flagship Android phones. All at a time when Samsung has begun to decontent their Galaxy S line, removing some of the features that made it stand out from the iPhone (MicroSD card slot and Magnetic Secure Technology with Samsung Pay).
We also don't know what kind of deal Apple has with Qualcomm regarding 5G modems. Could be that the A15 Bionic follows the example of the Snapdragon 888 and integrates the Qualcomm X60 5G modem, saving space inside the phone and allowing for a larger battery.
Apple may have removed a lot of useful features in the past, but removing the only remaining port would be a step too far.
And of course, if the iPhone 13 did remove the Lightning port, the original author could buy an iPhone 12 at that time, and it would be even cheaper.