Your comprehension of this technology is so limited that you actually think that’s how it works.
The letter simply indicates that the physical wiring in the cable is different to a previous iteration of the USB standard. There isn’t a great deal of reason that they would change that now it has a pretty good potential for energy transfer and high data transfer speeds. In 15 years they might be looking at changing it but not any time soon.
Usb and B came out at the same time in the '90s for god’s sake.
If I traveled 100 years into the future I actually wouldn’t be surprised if they’re still using USB-C. A different version of USBC but it’ll still be the same cable, the only reason they would upgrade to another cable is if they decided for some reason that it needed to be able to carry enough current to vaporize you.