Hey Chad. Paul from Ameriscan here. Hope all is well at APSN. well, i have wondered this as you have, and after looking at several resources, including
PFD: 800 MHZ RADIO SYSTEM NETWORK and some links in there, I am thinking its going to be a long while as phoenix fd stated in several places that they were dissatisfied with the in-building quality of the 800mhz radios, with all the cut backs included as AZscanner stated here, its probably going to be a while. However Mesa is using their vhf patch channels less and less, also there was a fire in mesa a couple days ago that was mostly on digital. Did you hear the hostage situation in gilbert yesterday. They were going back and forth on digital and vhf channels. Worst case scenario, just get some digital scanners ready to go so if they do change over you will be ready.