I notice average for Honda, Kia, Nissan etc in your linked article is $30,000... and that's explicitly exclusive of incentives and whatnots. AND inclusive of their luxury brands (Lexus, Infiniti, etc). That leaves room for lots of $20k cars, given that each of the brands has luxury models skewing the average as well.
It would be interesting to see either median, or # of cars in some representative brackets.