WiFi Example:
Town has 150 trucks and they are converting from analog to TRBO, same frequency.
Program channel 1 to analog, program channel 2 to digital.
Once vehicle installations are complete, switch infrastructure to TRBO and have all vehicles switch to channel 2.
Use WiFi to push out a new code plug that removes channel 1.
I did this and it worked great. I set up an RM server and a hotspot near the towns gas pump. When the vehicles came in to fuel up, the radios were automatically reprogrammed, removing channel 1. Some might say just leave the analog channel but the system also has GPS and if the driver switches to the analog channel, the GPS stops reporting. True, they can't hear the radio but if they are screwing off and have to hide their location, I don't think they care about hearing the radio.