Rural population is <20% of the total population of the US, so in the scheme of things I don't think this matters much. It sucks to be on the wrong side of that, but Tesla doesn't have to cater to every market.
You don't need to be truly rural for EV range to be an issue. While I couldn't use one as my only vehicle, Tesla's range would work pretty well for me although it's a ~$100K car when all is said and done--which is what I think the parent meant when he referred to "affordable." The options that are relatively affordable today only get about 80 miles on a charge which really isn't a lot unless you're driving around a pretty local area.
I live about an hour outside the local metropolis which is close enough to go in routinely for the evening and I couldn't take an 80 mile range car in.
