Sounds like a typical Motorola sales job. Take digital radios out of service when you sale the customer a new digital system.
I know of a federal government systems that is 8 years old, Astro SmartNet. In migrating to full Project 25, Motorola is making them get rid of the Project 25 Quantar repeaters (yes, I know that the CC is still 3600 baud) so that they can replace the system with a Project 25 system using 9600 baud control channels. Not a bad deal for Motorola. They are using the same antenna system, just replacing 10 repeaters, adding the "switch", and getting a big fat check for $2M.
Your tax money hard at work.