The more normal LGBT folks are seen to be, the less others fear them. I believe the expansion of equal marriage rights was a necessary step to full equality under the law; otherwise, ENDA would have been DRT (dead right there). As you say, it's flashy, and it appeals to peoples' hearts.
Aside from the riots of Stonewall, it seems every stride in equal rights has come about through working to overcome the demonization of LGBT. With every person of substance who has come out of the closet, every gay character written into a TV show, every piece of romantic same-sex fiction, we all realize more just how much we are all the same, and yet, how much diversity there is in being human.
I never had much of an opinion on LDS until Prop 8.Now, like you, I hope their anti-gay fervor creates the backlash to obtain the Supreme Court decision even Justice Scalia knows is inevitable.
Irony can be a beautiful thing.