I guess it's all in how you look at the Constitution and it's amendments. I see it as the tenth amendment exists just to remind us that the federal government is supposed to be limited. This isn't one of those long, drawn out legalese essays. It's a simple, one sentence rule, "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
Abortion is not mentioned in the Constitution or any of the amendments, so I don't know how it is possible to read that sentence and then think that the federal government, or it's court system, has any say on the matter of abortion.
If you disagree then I would be interested in hearing where you feel that the power to rule on abortion is delegated to the federal government, or prohibited to the states, by the Constitution.