One of my own favorite sites, long reachable only by a long and often difficult to traverse dirt road, had a paved road put in some years ago. And while there were some environmental arguments in favor (the dust from vehicles washed into local creeks and affected aquatic life), it hugely changed the nature of the destination at the end of the road.
Maybe the solution is to preserve these places until we have relatively cheap tech (like quadcopter drones) that can carry people to some of these places. Allow them to come in only at certain times or whatever so normally the place is still as wild as ever. Or VR connected to drones that people can fly around... there are many possibilities in the not-too-distant future that probably.
But right now the only practical way to make these places accessible is with paved roads so that's what happens.
My point is, the beauty of these places is in many cases derived specifically from their remoteness. Their inaccessibility is precisely the nucleus of what makes them what they are.
Sure it's absolutely unfair that disabled persons won't have that experience without far more effort, if at all.
But is the solution really to make it such that no one can?