These roads are eco-insignificant. If unused, 20 years after they're done, you will hardly be able to tell they were ever there.
If a road is built in the middle of nowhere, and nobody ever uses it, is it really there?
More importantly. If a road is built in the middle of nowhere, and it puts food on a families table, is it worth it?
Maybe so, but the roads(commonly called truck trails) built by the logging companies a hundred years ago in Michigan, Wisconsin, Minnesota, are still there. They are really not used much at all, not maintained by anyone, not plowed, etc. they are much enough of a road to be used - mostly by hunters. Even the abandoned railroad lines still seem to stay pretty clear many decades after they were stopped being used. One would think the road would disappear, but it doesnt seem to.