I spent most of my life in Hudson County, including an entire career in Law Enforcement there, and if all the municipalities decide to go to a common Public Safety radio system, I'd have to start believing in unicorns and other creatures one normally doesn't see when sober.
I wouldn't be against it mind you, both from a Public Safety and a taxpayer point of view, but the political realities there don't favor it. Never did. Most of the County's politicians can't stand each other and political alliances are very will of the wisp. Home Rule? Hudson County, Jersey City and Frank Hague defined the term nearly a hundred years ago.
It seemed a miracle to me when a few North Hudson cities and towns formed a regional Fire Service a couple of decades back (after years of discussion), but that's the last regional talk I've heard since then. It's true the 4 or so trunked systems used there are no longer spring chickens, and several of the larger PD's are still on analog, but if there's been any talk of a common County system, I haven't heard anything and I'm up there quite often. Here now as a a matter of fact.
That said, Hudson County OEM has become a much bigger player than they were twenty years or so ago. If there's any radio regionalization it will come slowly and with much more political discussion than there's been now, which is virtually nil. In reality, the municipalities control Public Safety. The Sheriff's Office, for example, while valuable is considered a secondary Police Agency, patrolling only County owned roads and facilities. This is not a denigration of a fine group of men and women, merely political reality.
I note that referenced plan is Fixed Base transmitters only. There are no mobile units. There does not seem to be a gap in any Public Safety coverage in any of the municipalities' radio systems. The Sheriff and all of the County PS agencies are still on their traditional frequencies. I suspect this is HC OEM jumping on some grant money with a future plan in mind for disaster purposes.
If there's a plan, great. Getting all the cities and towns to go for it? It's going to be a tall order.