I don't think this is salient to the discussion specifically of Greyhound shuttering service in rural Canada. There are no train lines that operate connecting most of the outposts described in the article to urban areas.
The availability of hugely subsidised gas and automobiles has seen people hoodwinked into taking their lives in their hands by driving insanely long distances in frequently dangerous weather. It is all part of costs being displaced onto individuals (who often welcome the displacement as they believe it increases their freedom). Some of those costs are of course also externalized into environmental impacts.
If you have access to gasoline through hours and hours of wilderness (hint: no gas stations).
If the roads are passable.
If you have a safe place to stop and sleep during your trip (hint: you don't).
I mean, you don't need to think about them for very long, but you do want to have a plan for being stuck for hours, or having to turn around in the middle of Nowhere, BC.
In any case, I'm pretty sure a bus needs the roads to be passable as well.