We already know from Massachusetts what happens. You want to rent out your church for weddings. Two gays stop by and want to be married in your church. You say no. They sue and win you either marry them or quit renting your church out. Next step two gays ask Mormon Bishop to marry them. He refuses. They sue and win. From then on no Mormon Bishop or pastor will have a license to marry. All weddings from then on will be in some judges office or by some Epicopalian and from there to the Temple. It goes on from there to speaking from scripture from the pulpit. Gays take offense, pass laws saying that is hate speech. Church loses tax exemption....Of course, you must have a liberal judiary which BO will be happy to provide. Civilization disintegrates. Canada is already there with the hate speech stuff from churches.
I do believe if we stand strong, and on the offensive, we can stave off the above scenario.