The appearance of a thing is not the thing itself. Courts imposing same sex marriage is not the same thing as accepting same sex marriage. How long ago was it that we had court ordered integration? Arguably racial relations are worse today than when that became law. How long has abortion been a right? The fight has not diminished a bit. It's only become more entrenched.
Gays and lesbians want acceptance of their relationships as normal. No judicial decision can force people to normalize homosexuality. Legal decisions can only go so far. They can't stop a family from disowning a homosexual child. They can't stop social groups from freezing that gay couple out. They can't stop parents from taking their kids home. While a gay couple can force a business to accommodate them they cannot force customer service.
Ultimately no law can force acceptance. Caring cannot be mandated.
When I say "lost cause" I'm only referring to the law. I know just like abortion, there will always be a division when it comes to gay marriage. I have pointed out many times for instance, that I will never view a gay couple as being married. I will never view them in the same light as a straight married couple.