The Economist has an interesting spin on the significance of King and Spalding's rejection of the case. I think they put it nicely:
This is the way social justice happens. Not with a bang, but with white-shoe law firms becoming uncomfortable taking certain kinds of cases.
I've noticed a change recently on the large LDS blogs I read. Virtually no one defends the LDS Church's position against civil recognition for gay families anymore. Virtually no one tries to justify the Church's blanket condemnation of committed same-sex relationships anymore. There's been a huge change since Prop. 8 several years ago, when you would find bloggers on the large LDS blogs standing up for the Church on this issue. That's all gone now.
To paraphrase The Economist: This is how social justice happens. Not with a bang, but with well-educated Mormon bloggers becoming uncomfortable taking certain stands on social issues.