E.J. Graff presents the best optimistic take I’ve seen yet. I wouldn’t say I’m fully convinced, but I hope she’s right that the outcome will be a net positive. She concludes with this:
Equal marriage rights can only be held by persuading three audiences—legislators, judges and voters—that equal marriage is just, that it helps some and threatens no one. The Supreme Court will neither sink nor save us; the truly final court is the court of public opinion. And there we are steadily winning.
See this, for example. The battle has not been won by a long shot, but the trend is encouraging. And certainly provides yet more evidence against the idea that successful litigation would produce some massive backlash against marriage equality.