Given the political climate of the day, I am not surprised that Utah's gay marriage ban was overturned. Unfortunately, I don't think that gay marriage proponents will stop with just legalizing it. Their next step will probably be to insist that marriage licenses be only valid where same-sex marriages are recognized and performed. Their reasoning will be that the government should not be granting licenses to be executed where people are hateful and homophobic (a word now used to define anyone who disagrees with the LGBT agenda).
Some churches will capitulate, some will proclaim that they need no authority from the government, while others, the LDS Church included I would imagine, will simply stop performing marriages and encourage their members to marry before a justice of the peace and then perform any religious ceremony. Regardless of the outcome, right and wrong will remain right and wrong.