Well, no. The "new precedent" is that clearly wrong precedents should not be maintained merely because they're precedent.
It's really a progressive stance, one that allows the errors of the past to be recognized and corrected, not clung to and, well, conserved.
Did you read Dred Scott? That is not what they said.
@volkris That's the same excuse for not overturning Dred Scott.
"Leave it to the legislative body" they said.