Your question mixes the three following issues: 1) zoning restrictions on number of homes on a private drive, 2) modification of existing easement agreements and 3) it seems someone is using the Private Road Act to acquire a right of way to their landlocked property. These are very difficult issues and are not really capable of being fully addressed online.
I am just now finishing re-writing my book on these topics for presentation at a program called Boundary Law at the Pennsylvania Bar Institute Center in Mechanicburg on June 28. You need to hire a lawyer that has been to one of my Boundary Law classes in the past. I assume you are on the mountain just west of town and are in Franklin County. You can start reading my guides on the topic of easements found on this site. I should say the Pennsylvania Supreme Court is tinkering with the Private Road Act.
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James S. Tupitza
212 West Gay Street
West Chester, PA 19380