The GOP is tripling down on blatant racism. Why would they improve with the black vote any time soon? people don't have that short a memory.
1) Not all black voters are ADOS, and non-ADOS black folks were never as Titanium D as ADOS folks even though they're still very D. (This is partly why I'm skeptical of reagente's 2020 estimates for black voters).
2) The GOP's racism isn't solely directed at black people.
My guess is anywhere from 88-12 to 80-20. Depends on how much ADOS voters trend R by, and whether the increasing immigrant Black population changes things.