Couple of things (totally my opinion). I think battery tech is not quite cheap enough, yet, to get to that price point. I've been watching the electric crate motor options coming out and the EV conversions that people have been doing and batteries are the most expensive components. For fun, I thought about a vintage Econoline with the crate Mach-E motor (like under $6k iirc), but the batteries to power it would be $20k+ for used batteries.
Second, you're correct in the average American scenario, but I would guess that digging through that data, it wouldn't be quite as normalized. Kinda like the public transport discussions. Great when the locations you want to travel to are close (NY, LA, Chicago, et. al), but not so efficient when you get to the flyover states. Like here in Austin. I live in the 'burbs on the edge of the Austin city limits and back when I had an office to go to, there wasn't a good way for me to get to work without a car. I would have been a two hour trip and still drop me about 5 miles from work. My point is, the average includes the huge populations of those big cities, which I assume (again, assume) will skew the numbers.
Third, the infrastructure isn't quite there yet. There are a few charging around, but not like fuel stations. Yes, you can plug in at home, but at assumes you have a home to plug into as opposed to an apartment.
All of the above, however, could have applied to the Model T, which helped overcome those obstacles. They were cheap by sheer volume and batteries will get there. They were sold to the average American, which congregated around cities. Gas was bought in cans from your local pharmacy, not from a fueling station. All of those came after more people bought cars.
So, why couldn't Ford do the same today? Perhaps it's because EV's aren't as life changing as the T was? The Model T's competition was the horse and buggy. The T offered a family to travel much farther than before, not have to worry about the health of an animal and travel distances much quicker. I would guess that it was one of the main factors of Americans branching out from the cities and expanding their base.
Today, the EV is competing with the car. Which is still readily available, with a good infrastructure. It doesn't provide the life altering change of moving from a horse to a car. An EV doesn't provide anything more than an ICE does other than the cost of running. In some ways, it's a step back for long distance travel.
-Rob