It's easy to construct a coherent interpretation of the Constitution that invalidates Roe without nuking the Ninth Amendment (the thing with fuzzy penumbras and unenumerated rights is that it is very easy to come up with equally coherent interpretations of what their scope is.)
It may be hard politically to get a Court majority appointed and confirms that agrees with eliminating abortion rights whatever the logical basis (or even without consensus on the basis; court decisions where there is a majority on the result but not the rationale are possible, so you don't need a unifying rationale to get a result.) But that's a different issue and nuke-the-Ninth types don't help that.
It's easy to construct a coherent interpretation of the Constitution that invalidates Roe without nuking the Ninth Amendment (the thing with fuzzy penumbras and unenumerated rights is that it is very easy to come up with equally coherent interpretations of what their scope is.)
It may be hard politically to get a Court majority appointed and confirms that agrees with eliminating abortion rights whatever the logical basis (or even without consensus on the basis; court decisions where there is a majority on the result but not the rationale are possible, so you don't need a unifying rationale to get a result.) But that's a different issue and nuke-the-Ninth types don't help that.