Yes, they will be useful until they are not. Their population, as a share of the general population, has fallen from 20% just after the Civil War to about 10% today.
The black percentage rose every decade between 1930 (9.7% of the population) to 2010 (12.6%), before falling slightly to 12.4% in 2020. The country is finished, in any case, as whites have fallen from still 88% in 1970 to only 61% in 2020 and being replaced by people who don’t have any allegiance to the US or any education in the founding principles of the nation.