A tipping point has been reached, not only on the issue of marriage equality, but on the broader political force of bully Christianity, a pernicious brand of the faith that tells people who don't have conservative social and political views that they "aren't Christian." That model has now failed where it used to work reliably; Waterloo has been reached.
To be clear, not all of those who sought to protect traditional man-woman marriage were bullies. Many acted out of a principled and consistent sense of their own faith, and stayed away from defining the faith identity of others. I am fortunate that the same-sex marriage opponents I know best avoided that tactic and amid our disagreement never suggested that I was no longer a part of the diverse and complex body of Christians.
Still, it is undeniable that many advocates for traditional marriage actively used the bullying tactic of asserting that there was only one "Christian" position on this issue, and that the Christian viewpoint rejected marriage equality. Unfortunately, their voices have too often been the loudest, and the ones to which the press is most attracted. That tactic has now been exposed as something worse than unprincipled, politically: It has been shown to be ineffective in the public arena.
Some will see this tipping point as a huge loss for Christianity, but it might instead be the faith's salvation. Bullying was always a terrible form of evangelism.