I assume it will be another justification for abortion eventually. After trying to make it socially acceptable, it won't be hard to make a "moral" argument for aborting the babies produced in such situations. Every form of birth control other than abstinence has a failure rate. When my husband had his vasectomy after my incredibly complicated, known at 11 weeks be a life threatening pregnancy for both me and my middle daughter (which we both barely survived life-of-the-mother advocates of abortion) we had to sign a legal document absolving the doctor of any responsibility should we fall into the failure rate. Even incestuous couples using birth control run the risk of pregnancy.