If that's the case, then they are reaping what they have sown. Church in the past was never about witnessing to nonbelievers but worshiping God. Paul kicked someone out of the church because he was living with his stepmother and he certainly had hard words to say about those who would profane the Lord's table. We're too accommodating to the tares. Look what has happened to the Anglicans.
Legally the Church can choose not to include them in the Directory. Just like the Boy Scouts, PRIVATE organizations have the ability to determine their membership. Granted, a constitutionally understanding like that is increasingly being challenged, but at least in regards to groups like the Boy Scouts, the Supreme Court has upheld the ability to choose membership. The couple will have zero constitutional grounds to sue.