If you want AC and a radio you’re looking at about 12k EUR, which definitely isn’t terrible. It’s a Renault subsidiary and you see a fair amount of them driving around.
So yeah, it’s not like offering an affordable bare-bone car isn’t possible in mature markets, it’s more likely that Americans just don’t have an appetite for them.
The affordable car is definitely being tested though. Renault discontinued the Twingo last year, which was their smallest car. Audi discontinued the A1, claiming there’s just no money to be made in their lowest segment.
It’s looking pretty bleak for the utilitarians among us, as electrification happens and safety features such as lane assist and emergency stop systems become mandatory, base prices will consistently be higher. You can only drive down the price of components so much.