If we're going to have a jury system, then we should get rid of any elements of the system that make it easier for the prosecution to stack the jury against the defendant. Otherwise, the point of having a jury is defeated. Some might argue, "We can't have jury nullification because some jurors might refuse to convict whites who lynch blacks." If we get to a point where members of a race are refusing to convict people of another race, maybe that means that the races should separate. It doesn't necessarily mean we need to change the jury system.
I favor repealing Federal Rule of Criminal Procedure 24(b).