The benefits would be enormous, not only for Quebec, but for Newfoundland and Labrador as well. I think the road would provide much quicker access to certain places, depending on it's starting point.
Trade between Quebec and Newfoundland and Labrador would increase and benefit the tourism and other industries. This region is poorly known and has enormous tourism potential. That's increasingly recognized.
This miserable pandemic has had one positive the effect: the crisis has encouraged people to explore their region and to visit it more and more. At some point, however, they get to the end of the road and have to turn around.
Completing the link to Newfoundland and Labrador can't be just a dream. It has to be built soon.
Finishing the road will also provide access to the region's natural resources. This vast territory has so much to offer and is largely unexplored.