The problem is that the Ninth does not give any power to the federal courts to over rule a state law.
The rights are "retained by the people". It is a factual determination whether people have "retained" a right. When a state law is evidence that they have not, there is no overriding it by anyone in the federal government.
No state law has ever been nullified by a federal court for Ninth Amendment reasons.
I'd like to see Griswold overruled just so this idea that the Ninth is a grant of power to the Federal government would be put to rest. Madison said when he proposed the Ninth that it was to prevent the unenumerated rights from being " assigned into the hands of the General Government". Which is exactly what happens if the federal courts use the Ninth as a souce of their power instead of a limit upon it.
But the 14th does.