Whether or not commercial EMS will change to digital remains to be seen. Rural/Metro and Monroe, while dispatched on some calls by ECD (R/M has the City 9-1-1 contract and Monroe contracts with a lot of volunteer ambulances for ALS and other coverage), operate their own distinct private radio systems.
Dave is right. (Tip 'o the hat!) I should have made the distinction between the private, commercial ambulance services and the fire and independent volunteer ambulances.
The commercials pretty much are their own world, and unless there is pressure on them, they'll likely maintain their own radio systems. However, they interact with volunteer fire and volunteer ambulance services constantly. Both commercials have all the county fire and ems channels in their radios so it would be highly likely that they have acquired narrow band equipment by now.
City fire, all other fire agencies in the county, and all other ems agencies are all pretty much in the same boat when it comes to radio systems. They are so operationally intertwined that their radio system has to be viewed as a single system. The migration to narrow band affected all of them in the same time period.
Unless there is a big infusion of money, I don't expect Monroe County fire and ems to move beyond narrow band for at least the next several years.