Are the blacks ever going to give up the right to being selected over whites, now that they have the majority of votes in the country? Or is it just going to be a permanent bias?

That is a potential failure mode, yes. People are aware of it. But one does not refuse to manufacture a car on the basis that it might, one day, hit a pedestrian.

It is not evil yet.

The current affirmative action policies are supposed to be temporary. If they are not, there is an additional line of defense against that failure mode; the policies state that the judicial services (for example) should 'broadly reflect the demographics of the country'. That means that any group that gets unfairly discriminated against has a claim.