The same way it happened for microusb->usb-C. Think of the law as more of a "get along shirt" applied to misbehaving kids/companies than a specific ban/enforcement. The big players can still decide on a new standard and start using it.

The process would be something like this: someone has a need that usb-C connector can't solve, some working group makes a new connector, large phone producers agree to start using it, they start using it.

Also, just like with usb-C, we'd most likely see the new connector on the laptops before the phones. If some new capability is needed, phones are unlikely to be the initial devices to need it (given low power / small size)