A few thoughts...
There will not be a black Barbie or any other type of non white Barbie. Only the white one. This info comes from my local store and a visit and subsequent phone call to the LA pro store.
There are black Barbies. And I do mean Barbie, not Teresa. Actual Barbie dolls with brown skin and black hair. I still have some of them in the box. If you pay attention, any black doll in the same clothing (usually pink) as the white doll is a Barbie. Teresa, as with all of Barbie’s friends, usually wears a contrasting color (blue to Barbie pink for example). And the original Barbie is, arguably, not blond, but a redhead- or at least the redder side of strawberry blonde.
It's not a fiscal or practical hardship for MAC and Mattel to make black dolls anymore than it is to make a MAC Barbie in the first place.
This is clearly a race issue, but not in the sense that MAC and Mattel hate black folks. It's rather a symptom of a much larger issue of exclusion of different viewpoints and voices from what is considered the mainstream perspective in this culture with race being highlighted as the most obvious exclusion. There is also the potential exclusion of men, people of different age groups, folks who aren't black or white, etc. I brought up the issue of the black Barbie because that is the area that I most strongly identify with. It’s disconcerting that Mattel and MAC, in particular, continue to participate in this sort of exclusion considering the company motto.
