I think that even if remote regions can be accessed by road, they certainly need government support and subsidy programs like those.
I'm going to reuse the example I just gave.
In Rouyn‑Noranda, where I live and where our company is based, people have to drive six to eight hours to get to Montreal. Anyone who has to see a medical specialist usually has to go to a major urban centre.
With the current level of service available through a major carrier, someone has to leave at least three days early to get to their appointment. They have to leave in the middle of the day and stay overnight in a hotel. They can't do the return trip in one day.
If support programs were in place, companies based in regions would be able to provide those air link services.