Well, if you are going by what Thomas said in his concurring opinion, then the federal government does not have the authority to promulgate laws on those issues. But each individual state could do so.
Right, his opinion is that any case settled through the due process clause should be overturned.
I'm not sure the rest of the court would agree so it is still up to congress to pass any laws on those matters.
Given some prior opinions, I think congress passing a law on the topic would make the court less likely to reverse Griswold, or possibly even hear the case. So action from congress now is warranted.