As new solutions are implemented, the old VHF system will be taken offline. I explained above what the turnpike it doing with counties that have trunked systems. The turnpike system passes through 15 counties that operate on trunked systems and 9 counties that use conventional systems. There's no hard timeline for the VHF to go, but the plan is to pull the plug on towers when they can.
So far, it would seem the turnpike has projects in the works or completed with Butler, Westmoreland, Somerset (all on ICORRS), Chester, Montgomery, and Bucks. I would imagine Dauphin/Franklin are in the pipeline since they share a trunked system. Both Cumberland and Lebanon are in the middle of trunked system upgrades so I would imagine nothing will change until their new systems are online. That leaves York and Luzerne systems to watch for new talkgroups.
Washington/Beaver/Allegheny/Bedford/Fulton/Huntingdon/Lehigh/Carbon/Lackawanna are the conventional system counties and I haven't seen anybody mention any changes in those counties.
No Huntingdon county units respond on the turnpike, that small stretch through their county is handled by Franklin or Fulton units on those counties' systems.