I’m assuming the gray areas are the greenways. Not understanding fully your comment about difficulty in moving around. Are you saying there would no longer be roads through them? If so, wow.
Eliminating signs of human habitation from the greenways and the associated buffer zones is the eventual plan. It may take a couple of generations but it will happen. I’m sure the main roads and bigger towns will still exist but tiny villages like where I live in Norvell are slowly being squeezed.
While wandering the state land in recent years I’ve found a couple of permanently closed roads in my area. I find road signs out in the middle of hundreds of square acres of wilderness. I asked the old timers about them and they tell me that lots of roads have been “abandoned” over the last 30 years or so.
In the 15 years I’ve been here I’ve seen two bridges taken out never to be replaced.