I would think if you are selling a house, property, etc that the expectation is that you would lose access. Its thousands of acres, why didn't the ranch keep a few thousand. They could have isolated their piece prior to putting the tract on the market if they wanted access.
Maybe i'm a bit jaded. When I bought my property it was years and years worth of folks showing up and trespassing. The same old story, my great, great uncle or my third cousin by marriage owned this property back in the twenties, we thought we could still use it. i dealt with that for 10 years. If the family wanted access they should have not sold it. They can't benefit financially from the sale and then expect to use the property as they had in past. Win Win situations rarely happen.
Yes, I’m jealous or bitter…whatever you want to call it. 
