They’re not abandoning wired Carplay. If they did make a portless phone, they have got to make a converter. There are 3rd party ones to convert wired to wireless Carplay, they’re kind of janky (I have one) but they work, mostly, Apple could make their own official one and it would work perfectly.
My idea would be to take the Magsafe puck, add 802.11ay wireless, and put ay wireless into the portless iPhone, and it would straight convert the USB signals to wireless and it would work best very close (like say magnetically bolted to the phone) but also work at about 10 feet from the source. Cars could start coming with wireless built into the car and they would work like it was wired (with no latency etc).
I could imagine they could connect to TVs too, either with Magsafe puck or built in, and they would no longer need to be on the same WiFi network for Airplaying. Eventually, this new wireless will overtake wired connections, as it’s Thunderbolt-level speeds (though Thunderbolt 5 will maintain its edge, but 10-20 Gbps is plenty for normal people). Imagine one day having docks that offer charging and Thunderbolt when plugged in, and wireless when not plugged in. We might be using iPhones as work computers in the future, the new Apple XDR Max monitor will have Magsafe on the stand and wirelessly beam video signal from the iPhone and it will run MacOS. Pure bliss.