If you're in Amargosa, Shoshone, Tecopa, Wonder Valley, Lanfair Valley, Kelso, Amboy, Cadiz, Fenner, etc., it's a long way off from anything.
Pop open Gooogle maps and try to find the nearest dispatch location for an ambulance to Fenner, and then put that into perspective with the amount of traffic on the I-40 corridor. CHP can call an airship, but I've seen burn patients sit dying for an hour while waiting for a helicopter to become available for dispatch.
People adapt to their environments, if you have to fix your car in the country, you learn to fix your car. If you have to fix your car in the city, you learn to schmooze the repair guy into giving you a better deal.
It took 25 minutes for the EMTs to arrive. But that is because the nearest EMT team was not on another call. Otherwise, it could have take 45-60 minutes to get a team from the next nearest town/county.
Later that day on the way home to Seattle we stopped at an urgent care to get stitches for $175.
Though, I am seriously thinking about getting an AED to keep out there.
You can do it in a week, living on-site.
Edit: There's also a component on helicopter operations, such as laying out a landing site for when things get really spicy.
Statistically, less people, fewer emergencies, but that's not much comfort when you're the one having a statistically unlikely emergency!
That's pretty far out; I think that's pretty extreme. At least in Idaho/WA IMO (different geography and settlement pattern, prolly). But your point is still valid for the bulk of rural US - you just gotta know how to deal, because the cavalry is a ways out and expensive.